СПОСОБ ЗАПИСИ И ВОСПРОИЗВЕДЕНИЯ ИНФОРМАЦИИ НА МАГНИТНЫХ ПОЛОСАХ И СООТВЕТСТВУЮЩЕЕ УСТРОЙСТВО СЧИТЫВАНИЯ/ЗАПИСИ

Изобретение относится к способу и устройству для воспроизведения звукового и/или видеосигнала, записанного на магнитной полосе. Последовательность меток времени распределена вдоль магнитной полосы. Метки времени определяют блоки записи и заданный интервал времени Т для воспроизведения каждого из указанных блоков. Средство считывания, перемещаемое вручную, предназначено для считывания указанной записи и последовательности меток и формирования первого сигнала считывания записи и второго периодического сигнала считывания последовательности меток. Память предназначена для сохранения упорядоченной последовательности выборок указанного первого сигнала. На второй последующей стадии осуществляется считывание указанных сохраненных выборок в порядке, соотнесенном с порядком записи. Средство воспроизведения соединено с указанной памятью для приема указанных выборок сигнала и преобразования их в акустический и/или видеосигнал. Средство управления и синхронизации соединено со средством считывания для ...

Многослойная магнитная пленка с взаимодействием Дзялошинского-Мория и способ управления асимметричностью движения доменных границ в ней

Группа изобретений относится к области электроники. Многослойная магнитная пленка с взаимодействием Дзялошинского-Мория содержит подложку, на которой сформирована среда из немагнитного слоя с сильной спин-орбитальной связью и ферромагнитного слоя, при этом многослойная магнитная пленка типа «подложка/B/X1/Y/X2» с перпендикулярной магнитной анизотропией содержит полупроводниковую подложку из Si с ориентацией (111), буферный слой B из Cu толщиной 1-5 нм, немагнитный слой X1 из Pd толщиной 3-15 нм, который имеет среднеквадратичную шероховатость 0,25-0,8 нм и средний радиус островка 8,5-12,2 нм, ферромагнитный слой Y из Co толщиной 0,5-15 нм и немагнитный слой X2 из Pd толщиной 0,5-5 нм. Технический результат - повышение плотности записи информации, и скорости чтения/записи устройств хранения данных, и работы логических устройств на основе магнитных пленок. 2 н.п. ф-лы, 7 ил.

Способ воспроизведения информации с магнитного носителя

Изобретение относится к области магнитной записи и позволяет расширить частотный и динамические диапазоны воспроизведении информации с магнитного носителя . Устройство, осуществляющее способ. содержит индукционную магнитную головку 1 с обмоткой 2, преобразователь 3 ток короткого замыкания-напряжение, инвертор 4, резистор 5 и выходные шины 6 воспроизведенной информации. Вследствие компенсации магнитного потока в магнитном сердечнике индукционной магнитной головки 1 устраняются потери, обусловленные материалом магнитного сердечника, что расширяет частотный диапазон воспроизводимой информации. Введение новых связей между элементами устройства позволяет формировать сигнал, пропорциональный намагниченности магнитного носителя, и повышает отношение результата воспроизведения к помехе . Изобретение является дополнительным к авт. св. № 1150644. 1 ил. с ND ЬО СО ел ...

Устройство для калибровки индикатора уровня записи магнитофона

VIDEOSIGNAL-WIEDERGABEGERAET MIT AUFNAHMEWIEDERHOLUNGSFUNKTION UND ZUGEHOERIGES VERFAHREN

Gerät- und Aufzeichnungsmethode für digitalen Daten

Kamera, geeignet für photographische Filme, die bestückt sind mit magnetischen Speicherabschnitten

Dünnfilm-Magnetkopf und seine Verwendung

MAGNETKOPF UND MAGNETKOPFVORRICHTUNG

Magnetowiderstandseffekt-Magnetkopf und zusammengesetzter Magnetkopf

Verfahren zur Optimierung eines Schreibstromes für mindestens einen drehbaren Magnetkopf und Anordnung zur Ausführung eines derartigen Verfahrens

SCHALTUNGSANORDNUNG ZUM SELEKTIVEN DURCHSCHALTEN VON LESESIGNALEN EINES MEHRFACHMAGNETKOPFES BEI EINEM MAGNETSCHICHTSPEICHER

ANORDNUNG MIT MAGNETSCHREIBKOPF SOWIE SCHREIBVERSTÄRKER MIT KAPAZITIVER STROMKOMPENSATION

KOMBINIERTES MAGNETISCHES KANALSIGNALSENSOR- UND SERVOREGELUNGSSPURNACHLAUFSYSTEM UND VERFAHREN.

Geraet zur magnetischen Schallaufzeichnung mit einer Einrichtung zur Erzeugung einer Echowirkung

Magnetkopf fuer bandfoermige Magnetogrammtraeger mit Nutz- und Pilottonaufzeichnung

Wiedergabeschaltung für einen magnetoresistiven Kopf

Magnetisches Aufzeichnungsgerät

Dereferenzierungsdatenstrukturen zum Verwalten von Dateisystem-Metadaten

Es sind hier Systeme, Verfahren und Software beschrieben zum Verwalten von Dateisystem-Metadaten in einer Datenspeicherungsvorrichtung. In einem Beispiel umfasst eine Datenspeicherungsvorrichtung eine erste Speicherzone, eine schuppige Magnetaufzeichungs(SMR)-Zone und ein Speichersteuerungssystem. Das Speichersteuerungssystem ist eingerichtet zum Unterhalten von Dateisystem-Metadaten an einem Metadatenort der ersten Speicherzone für Nutzdaten in der SMR-Zone. Das Speichersteuerungssystem ist weiterhin eingerichtet als Reaktion auf Erfüllung einer Nutzungsbedingung für die Dateisystem-Metadaten an dem Metadatenort, zum Identifizieren von Metadatenorten in der SMR-Zone zum Umleiten und Speichern der Dateisystem-Metadaten. Das Speichersteuerungssystem ist auch eingerichtet zum Unterhalten einer Derefferenzierungsdatenstruktur an dem Metadatenort der ersten Zone, die die Metadatenorte in der SMR-Zone mit den Dateisystem-Metadaten korreliert.

MAGNETISCHE AUFNAHME-/WIEDERGABEVORRICHTUNG.

Schreibsteuerkreis fuer Magnettrommelspeicher

Datenspeicherungssystem

PCM-AUDIOAUFZEICHNUNGS- UND/ODER WIEDERGABEGERAET.

Verfahren und Vorrichtung zur Auswertung von binaeren Aufzeichnungen auf magnetischen Aufzeichnungstraegern

Rauscharme Vorverstärkerstufe, insbesondere für Magnetköpfe

Recording and reproduction of stored data - using laser beam passing controllable magnetic deflection field

Data is recorded and/or reproduced by means of a laser beam (2) striking the storage medium (3). This laser beam is so directed that before it strikes the medium or after it passes through it, it falls through the pole gap (5) of the recording and/or reproduction head (4). The laser beam can pass through a controllable magnetic deflection field (10) which is placed in front of the storage medium and pole gap, looking in the beam direction, and points at right angles to the beam. This field allows optional deflection of the beam at a predetermined angle in relation to the direction of movement of the storage medium.

VERFAHREN ZUM BETRIEB EINER GEGENTAKT-VERSTAERKERANORDNUNG UND VERSTAERKERANORDNUNG HIERFUER

LESEVORRICHTUNG FÜR EINEN LÄNGLICHEN MAGNETISCHEN DATENTRÄGER

Magnetischer Aufzeichnungsträger mit hoher Aufzeichnungsdichte

A longitudinally oriented magnetic recording medium is described which has advantageous properties for digital recording, ie. a very small pulse width and high output level, and wherein the quotient l r /(d * solidtriangle; up triangle filled* L) (l r = residual polarization in mT, d = layer thickness in m, L = mean particle length in nm) is greater than 18 and the pulse width stated as PW 50 is smaller than 500 nm.

Datenaufzeichnung mit Kopierschutz

VERFAHREN UND VORRICHTUNG ZUR SICHEREN DATENSPEICHERUNG UND HANDHABUNG MITTELS MAGNETISCHER TRÄGER

VERFAHREN UND ANORDNUNG ZUR EINSTELLUNG VON SCHALTZUSTAENDEN AN EINEM MAGNETBANDGERAET

Write method for Improving performance of data storage system and apparatus therefor

Reader for a low-flying magnetoresistive sensor

Disk drive with preamplifier with isolation for multiple readers in a slider with a common return signal

A disk drive has a common signal return lead 79 that interconnects a plurality of read transducers in a slider through the suspension to a preamplifier. The preamplifier 60 has an isolated differential amplifier 61, 62 for each of the plurality of readers in the slider. The set of signal traces in the suspension include a common signal return lead for the plurality of readers in the slider and a plurality of dedicated signal traces each connected to a corresponding read transducer. The isolated amplifiers each have a separate bias voltage source and power supply isolation elements 91-94 for both power supply polarities Vcc and Vee for reduced crosstalk signal and noise between amplifiers. The suspension may include a shielding network of conductive material in a second layer disposed above a first layer containing the dedicated signal traces.

Method and apparatus for audio dubbing control

Magnetic recording and reproducing

... 676,766. Magnetic sound recording and reproducing apparatus. BRUSH DEVELOPMENT CO. Feb. 13, 1948. [Dec. 5, 1946] No. 4259/48. Class 40 (ii). In a magnetic recording and reproducing system, the recording head is energized by a constant frequency alternating current during recording and gradually de-energized at the end of a recording period. In one embodiment, a supply reel 21 feeds the record track 31 past an erasing head 32 and recording/reproducing head 33,. capstan 23 and limit switch 25 to a take-up reel 22. Felt pads 40 urge the record track 31 into contact with the heads 32, 33 and separate driving motors 41, 42, 43 are associated with the supply reel 21, take-up reel 22 and capstan 23 respectively. The switch assembly 35 controls the various functions of the apparatus being provided with pushbuttons 50 ... 55. The inward action of one push-button causes all the others to be released to the outward position. In the playback outward position of push-button 55, reproducing head 33 is ...

Read-out device for dynamic magnetic stores

... 1,084,758. Magnetic recording heads; local circuits. SOCIETE D'ELECTRONIQUE ET D'AUTOMATISME. Aug. 20, 1965 [Oct. 8, 1964], No. 35902/65. Heading G5R. To improve the realizable packing density of binary digital signals on a magnetic tape, the respective outputs of a balanced playback head 1 are fed to a pair of delay lines 6-9, 10-13 terminated by their characteristic impedances 19, 20, whose length is a fraction (preferably a half) of the characteristic period of the shortest recorded digital period. The delay elements are balanced symmetric. ally about the mid-point 11-12 of one of them and appropriate fractions of the tapping points are summed by resistors 14-18, whose output is fed to known reconstitution circuitry. Additional delay elements 2, 3, adjustable by varying-direct currents I c in their secondary windings may be used to balance lack of symmetry in the head outputs and to set a desired overall phase delay for the playback system.

DATA STORAGE MEDIUM TRANSDUCER CONTROLLING APPARATUS

... 1446255 Transducer controlling apparatus INTERNATIONAL BUSINESS MACHINES CORP 28 Jan 1974 [27 Feb 1973] 03860/74 Heading G5R [Also in Division G3] Apparatus for controlling the operation of a transducer 10 for performing data writing operations on tracks on a relatively moving record medium 15 is operative to automatically move the transducer into a first position in which it extends over any selected track and beyond one edge of said track and to subsequently automatically move the transducer into a second position in which it extends over the selected track and beyond the other edge of that track the apparatus placing the transducer in an erase mode when in said first position and in a write mode when in said second position. The data tracks are concentric annuli on a magnetic disc 15. The start of each track is marked by an index mark (17), Fig. 1 (not shown), detected by index transducers, and each track is divided into sectors each having a sector identification, ID, (19), at the start ...

Recording circuits for toll road tickets

Driving magnetic recording heads

A recording head (10) can be driven almost directly by a digital chip (21). The present invention proposes a method for recording on a magnetic medium using apparatus in which the analogue magnetic recording head (10) is driven not by a filtered and amplified analogue signal derived from a digital signal but instead by the digital signal itself - specifically, by a stream of discrete two-level digital values (25) rather than a continuous analogue waveform. The magnetic recording and playback processes serves to average-out these digital values and result in a recording equivalent to the analogue process without requiring any mixed signal (analogue and digital) processing. The apparatus consists of a digital IC which outputs directly to a 1-bit DAC or analogue switch, this signal being used directly to drive an inductance type magnetic recording head.

DRUM ASSEMBLY FOR A MAGNETIC RECORDING AND REPRODUCING APPARATUS

Circuit and method for reproducing a luminance signal compatibly between different video systems

A dual mode luminance signal playback processing circuit is adapted to both an improved VCR in which the luminance signal is subjected to high end frequency folding prior to recording and a flag notifying such is added to the tape and a standard VCR. The luminance signal playback processing circuit detects whether the frequency folding flag is inserted in a synchronizing signal included in the reproduced luminance signal and selects the correct one of two luminance signal processing paths in accordance with the result. ...

Video cassette recorder capable of dubbing high fidelity audio signals

Method and apparatus for correcting digital asymmetric read signals

Coding a transmitted signal for identification

A transmitted signal is coded by a method which comprises generating, in response to a triggering event (1), (e.g. the R-wave in an electro cardiographic signal), a signal comprising a sequence of a plurality of bursts (2). The coded signal is detected by counting the number of bursts (2) received during a predetermined time (3). This avoids interference between signals from a plurality of patients. Application is to signals using radio, line, infra-red or ultrasound.

"APPARATUS FOR PROCESSING A VIDEO SIGNAL"

Electronic appliances

The operation of an electronic appliance, such as a cassette tape deck, is controlled completely or partially by switch operation. The appliance includes a memory for storage of control information, setting devices, such as switches, for entering the control information, a memory lock or latch for controlling the operating state of the appliance based on the control information supplied from the memory or from the setting devices to the memory lock, and for locking the appliance into such operating state, a display arrangement adapted for display of the setting information and for display of the information in the memory lock, and a setting change display indicator. The setting information stored in the memory can be checked by actuating a check switch, which causes the setting information stored in the memory to be displayed without affecting the operating state in which the appliance is locked. When the operating state is changed by a setting operation while the information previously ...

RECORD VERIFY AND OPTIMIZE SYSTEM

Disk drive system and removable disk cartridge adapted for downward compatibility

METHOD AND APPARATUS FOR RECORDING INFORMATION ON MAGNETIC DISK

INTERMITTENT MAGNETIC RECORDING/REPRODUCING DEVICE

Helical scan type magnetic recording apparatus

A miniature helical scan video tape recorder (VTR) utilizes a reduced-diameter guide drum, but the video signals recorded thereby onto the tape have a standard track pattern and can be reproduced using a standard VTR having a guide drum of standard diameter D1. In the miniature VTR, the tape is wrapped for a tape wrap angle alpha (e.g., substantially 300 degrees) at a still angle theta 2, whereas the standard VTR uses a wrap angle of 180 DEG and a still angle of theta 1. In order to ensure that the miniature VTR achieves the same record track length l'N and recording angle theta 0 as the standard VTR, the diameter D2 of the miniature VTR is selected to satisfy the equation where fV is the video field frequency. The still angle theta 2 satisfies the equation the video signal to be recorded is given a non-standard horizontal scanning frequency f'H according to the relation where fH is the standard horizontal scanning frequency. The recording head can be provided with two gaps for double-azimuth ...

REPRODUCTING DEVICE

Magnetic recording method and recording/reproducing circuits for toll road tickets

Circuit and method for reproducing a luminance signal compatibly between different video systems

DIFFERENTIAL AMPLIFIERS

... 1536161 Transistor amplifiers INTERNATIONAL BUSINESS MACHINES CORP 7 April 1976 [27 May 1975] 14069/76 Heading H3T A differential amplifier for driving a load 18, 20 with substantially zero direct current offset, e.g. for a magnetic recording head, comprises a pair of transistor amplifiers 12, 12, each amplifier having emitter 1, base 2 and collector 3 terminals, the two terminals 1, 3 carrying substantially equal currents, the terminals 1 being coupled via feedback means 26, 26 to the respective terminals 2, 2, coupling 40 between the amplifiers to form the differential amplifier and differential input means 30, 32. Low impedance coupling capacitor 40 equalizes the potentials of points 46, 48 for signal frequencies, and the action of differential amplifiers 26 in the feedback paths is to render the D.C. potentials of points 46, 48 equal to a reference voltage Vref applied to the non-inverting inputs of both amplifiers 26. Resistors 24 are matched, and thus the direct current components ...

MATRIX AMPLIFIER CIRCUIT

... 1536385 Transistor switched amplifiers CONTROL DATA CORP 9 June 1977 [7 Oct 1976] 24104/77 Heading H3T An amplifier for selectively amplifying signals received from a number of low impedance magnetic heads 12, 14, 16, 18 comprises individual common base input amplifiers 30 ... 44 and a single output common collector amplifier 52, 54. Common mode signals are rejected by negative feedback via emitter coupled pair 68, 76 which form a feedback current source.

Circuitry for suppressing spurious electric signals

... 808,037. Pulse circuits. NATIONAL CASH REGISTER CO. Feb. 6, 1957 [Feb. 23, 1956], No. 4042/57. Class 40 (6). Fig. 1 shows a circuit for amplifying shaping and gating the signals sent by the reading-heads associated with the channels on a rotating magnetic drum 100. As the drum 100 revolves the substantially square magnetic saturation pattern 129, Fig. 2, of binary digits 1 and 0 recorded on channel 1 and represented at 138, Fig. 2, induces a waveform 130, Fig. 2, at head 102 in which associated with e + and e - pulses corresponding to the leading and trailing edges of waveform 138 unwanted overshoot is also present. The play-back coil 104 is loaded by resistor 108 so that the oscillatory pulses 131, Fig. 2, are quickly damped out. The signal is amplified in negative feedback amplifier stage 133 and applied directly to cathode follower stage 134 to produce the waveform shown at 140, Fig. 2. This signal is inverted by transformer 110 and clamped by diodes 113, 114, the potentiometer 137 being ...

MAGNETIC TRANSDUCING DEVICE OPERATING WITH BUBBLE DOMAINS

... 1531802 Magnetic recording head PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 27 Feb 1976 [3 March 1975] 07814/76 Heading G5R [Also in Division H3] A magnetic recording head wherein the magnetic field patterns of coded series of magnetic bubble domains set up in a layer 81 are transferred to a magnetic recording medium 84, e.g. a tape, comprises a shift register or channel 85 which is filled with a succession of coded series of domains by a generator 82 and coding device connected to the signal input, the pattern of each complete series being transferred to the medium 84 periodically using a magnetic transfer field. The transfer field may itself be energized periodically, or the layer 81 may be vibrated to contact the medium 84 periodically, the transfer field being continu. ously energized; in the former case, control of the field may be in accordance with synchronizing pulses of the signal to be recorded, in the case of video information, or in accordance with an edge detector for the ...

Process for the realization of digital systems of recording and/or magnetic reproduction.

Improvements with the processes of tape recording.

A method for restoring information having made the object of a home record, and instrument for the implementation of this process.

AS INTEGRATED CIRCUIT DEVELOPED MECHANISM FOR THE CONTROLLING OF A LOESCH AND A BIAS POWER SOURCE GENERATOR

MAGNETIC RECORDING AND PLAYBACK UNIT

MECHANISM FOR THE PRODUCTION OF A SOUND RECORDING

EINRICHTUNG ZUR HERSTELLUNG EINER TONAUFZEICHNUNG

MEMORY DEVICE FOR MULTI-MEDIA OBJECT DATA WITH CRUDE ARENE OF CHANGE OF MODES OF OPERATION

VORRICHTUNG ZUR AUFZEICHNUNG VON TON- INFORMATIONEN AUF EINEM TONTRAEGER

MAGNETBANDGERAET

TAPE DECK

DEVICE FOR THE RECORDING OF CLAY/TONE INFORMATION ON TONING WHEELS

SWITCHING CONFIGURATION FUER MAGNETIC SOUND EQUIPMENT

PROCEDURE AND DEVICE AS A CHECK OF THE BIAS DURING MAGNETIC RECORDING.

PROCEDURE FOR THE REALIZATION OF A LINEAR STANDARDISED MAGNETIC VOLUME.

SWITCHING CONFIGURATION FOR THE REVERSAL OF A MAGNETIC FIELD.

PROCEDURE FOR THE AUTOMATIC OPTIMIZATION OF THE AUFSPRECHSTROMS FOR THE RECORDING OF A VIDEO SIGNAL AND AN ARRANGEMENT FOR THE EXECUTION OF THE PROCEDURE.

SWITCHING CONFIGURATION FOR THE REVERSAL OF A MAGNETIC FIELD.

DEVICE WITH SWIVELLING SOLENOID ACTUATOR.

SWITCHING CONFIGURATION TO THE PROTECTION OF DATA STORED ON A MAGNETIC RECORDING CARRIER.

DATA SEIZURE WITH COPY PROTECTION

INFORMATION RECORDING AND - RENDITION PROCEDURE AUF/VON MAGNETIC STRIPE AND ASSOCIATED EQUIPMENT

A ROTARY HEAD DRUM FOR A SMALL-SIZE VCR

Method and apparatus for recording signals on a record carrier, measurement method and measurement device for use in the recording method and the recording apparatus, and record carrier.

Method and apparatus for reading recorded magnetic media using an array of reading elements

MAGNETIC RECORDING CONTROL CIRCUIT

BURIED CONTROL SIGNAL RECORDING SYSTEMS AND METHOD

TWIN TRACK VERTICAL MAGNETIC RECORDING SERVO CONTROL METHOD AND APPARATUS

TWIN TRACK VERTICAL MAGNETIC RECORDING SERVO CONTROL METHOD AND APPARATUS The invention discloses a twin track servoing method and apparatus useful for vertical magnetic media recordings. Vertical magnetic media are those in which the magnetic vector in the medium is oriented perpendicular to the surface of the medium instead of lying laterally or longitudinally in the surface of the medium. There are two servo tracks of essentially constant and opposite magnetic polarity recorded on the vertical magnetic medium for each data channel on the medium. The servo tracks themselves may be segmented into reference zones and control or guard zones and they may be recorded on a dedicated surface of a magnetic medium or on the same surface as the data and interleaved with data tracks. When the servo tracks are alternated with data tracks on the same surface of the medium, a single read/write head for twin track recordings may be used to simultaneously read servo signals and data signals. When the ...

MAGNETIC HEAD SWITCHING SYSTEM

A switching system for use with magnetic heads and providing protection for the read or write circuits while the other is being used and further substantially reducing any losses or distortion in the read signal when the circuit is switched to the read mode.

DIGITAL FREQUENCY COMPARATOR

ELECTROMAGNETIC TRANSDUCER HEAD ASSEMBLY

COMPUTER MAGNETIC DRUM WRITING CIRCUITS

VIDEO SIGNAL RECORDING AND/OR REPRODUCING DEVICE

MULTI-TRACK MAGNETIC SIGNAL REPRODUCING APPARATUS

In a multi-track magnetic signal reproducing apparatus, a plurality of MR heads including MR (Magneto-Resistance Effect) elements are provided, corresponding to tracks on a magnetic tape. At the time of reproduction, constant current from a constant-current power supply is sequentially supplied, as a pulse-shaped current for detecting a signal, to each MR element by switching a switch in response to a prescribed clock signal. An output voltage from each MR element, related to reproduction of a magnetic signal on a corresponding track, is sequentially provided to one input side of a differential amplifier. In the differential amplifier, the offset voltage of each MR element provided to the other input side and the above-described output voltage are differentially amplified, and only voltage due to the reproducing magnetic signal of each track is accurately extracted. Accordingly, the supply of pulse-shaped current effectively suppresses an increase in the amount of consumption current regardless ...

BROADCAST SIGNAL RECEIVER WHICH AUTOMATICALLY SETS AN INTERNAL CLOCK

BROADCAST SIGNAL RECEIVER WHICH AUTOMATICALLY SETS AN INTERNAL CLOCK Broadcast signal receiver which has an internal clock controls an internal or external tuner which receives a plurality of broadcast signals to tune to a predetermined broadcast signal which includes time data indicating a local time. The broadcast signal tuned to is supplied as a tuned output signal. The time data is extracted from the tuned output signal and the internal clock of the broadcast signal receiver is automatically set to the local time indicated by the time data.

METHOD AND APPARATUS FOR DIGITALLY RECORDING AND REPRODUCINGDATE RECORDED IN THE VERTICAL BLANKING PERIOD OF VIDEO SIGNAL

A digital video and audio signal recording and/or reproducing device comprising: a recording format having a first recording area for recording a coded video signal, a second recording area for recording a coded audio signal, and a third recording area for recording an audio associated data constructed in pack form; means for coding the video signal and recording it in the first recording area; means for coding the audio signal and recording it in the second recording area; means for forming in pack the audio-associated information inserted in a vertical blanking period of the video signal and recording it in the third recording area; means for reproducing the coded video signal from the first recording area and coding the video signal; means for reproducing the coded audio signal from the second recording area and coding the audio signal; and means for reproducing the audio-associated information formed in pack from the third recording area and reading out the associated information.

Verfahren und Vorrichtung zur Aufzeichnung von Magnetogrammen.

Verfahren zum Herstellen von Schallaufzeichnungen.

Magnetic recording head and magnetic recording apparatus

An example magnetic writing head includes a main magnetic pole, a coil to generate an ampere magnetic field to magnetize the main magnetic pole to cause the magnetized main magnetic pole to generate a magnetic field, and a laminated body. The laminated body includes a first magnetic layer having a coercivity lower than the magnetic field applied by the main magnetic pole and a second magnetic layer having a coercivity lower than the magnetic field applied by the main magnetic pole.

Method of Forming a Plasmon Antenna with Magnetic Core for Thermally Assisted Magnetic Recording

A method of forming a TAMR (Thermal Assisted Magnetic Recording) write head that uses the energy of optical-laser generated edge plasmons in a plasmon antenna to locally heat a magnetic recording medium and reduce its coercivity and magnetic anisotropy. The method incorporates forming a magnetic core within the plasmon antenna, so the antenna effectively becomes an extension of the magnetic pole and produces a magnetic field whose maximum gradient overlaps the region being heated by the edge plasmons generated in the conducting layer of the antenna surrounding the antenna's magnetic core.

Disk drive calibrating a laser write power for heat assisted magnetic recording

A disk drive is disclosed comprising a head actuated over a disk, wherein the head comprises a laser for heating the disk while writing data to the disk. The disk drive receives write commands, and increases a power of the laser to a write power for heating the disk while writing data to the disk. A calibration interval is adjusted based on the power applied to the laser over time, and the write power is calibrated at the calibration interval.

Magnetization switching through magnonic spin transfer torque

The subject application describes systems and methods that drive magnetization switching through magnonic spin transfer torque. A spin current is provided to a first magnetic layer with a first magnetic state. The spin current facilitates magnetization switching via a magnonic spin transfer torque in a second magnetic layer with a second magnetic state that is separated from the first magnetic layer by an interface. Alternatively, a spin current is provided to a first magnetic domain with a first magnetic state. The spin current facilitates domain wall propagation via a magnonic spin transfer torque. The domain wall is between the first magnetic domain and a second magnetic domain in a second magnetic state.

DEVICE, METHOD OF FABRICATING A MEDIA AND METHOD OF SERVO WRITING

A device may be provided. The device includes a media including a servo layer and a data recording layer, and a recording head including a dimension sized to produce a magnetic writing field to write servo information on the servo layer. 1. A device , comprising:a media comprising a servo layer and a data recording layer;a recording head comprising a dimension sized to produce a magnetic writing field to write servo information on the servo layer.2. The device of claim 1 ,wherein the data recording layer is disposed between the recording head and the servo layer.3. The device of claim 1 ,wherein the recording head is a longitudinal ring recording head.4. The device of claim 1 ,wherein the recording head is a single pole perpendicular magnetic recording head.5. The device of claim 1 ,wherein the recording head is a shingled recording head.6. The device of claim 1 ,wherein the recording head is configured to write servo information on the servo layer using a shingled writing scheme.7. The device of claim 1 , further comprising:a further recording head configured to produce a magnetic writing field to write data on the data recording layer.8. The device of claim 7 ,wherein the device is configured to adjust a writing current of the further recording head.9. The device of claim 8 ,wherein the further recording head is configured to adjust the magnetic writing field when the writing current is adjusted.10. The device of claim 9 ,wherein the magnetic writing field of the further recording head is smaller than the magnetic writing field of the recording head.11. The device of claim 7 ,wherein the further recording head has a smaller dimension than the recording head.12. The device of claim 7 ,wherein the further recording head is a disk certification head.13. The device of claim 1 ,wherein the device comprises any one of a group consisting of a data storage device, a disk servo writer, a spinstand, a disk certifier and a drag tester.14. A method of fabricating a media ...

Medium, method of fabricating a medium, recording system and method of controlling a recording system

A medium may be provided. The medium includes a servo layer, a data recording layer, and a heat sink layer disposed between the servo layer and the recording layer.

Perpendicular magnetic recording write head with ladder network compensation circuitry on slider body for write current overshoot at write current switching

Write enhancement circuitry on the head carrier of a magnetic recording disk drive provides additional write current overshoot beyond that provided by the write driver circuitry. The write enhancement circuitry is formed on the head carrier as ladder network blocks. A first ladder network block is a first capacitor C 1 located in parallel with the write coil. The second ladder network block includes a second capacitor C 2 having substantially the same inductance L 2 . The compensation circuitry is referred to as a ladder network because additional ladder blocks, like the second block but with different values of capacitance and inductance, may be located on the head carrier.

Implementing spin-torque oscillator sensing with enhanced demodulator for hard disk drives

A method, apparatus, and system are provided for implementing spin-torque oscillator (STO) sensing with a demodulator for hard disk drives. The demodulator measures an instantaneous phase of the readback signal from a STO sensor and converts the readback signal into a signal that is proportional to the magnetic field affecting the STO frequency during a bit time. The converted signal is used for processing by conventional data detection electronics.

Implementing spin-torque oscillator sensing with enhanced delay control feedback circuit for hard disk drives

A method, apparatus, and system for implementing spin-torque oscillator (STO) sensing with an enhanced delay control feedback circuit for hard disk drives. A detector receives an input signal from a STO read sensor having an oscillation frequency related to the strength of the detected magnetic signal field. The received input signal is mixed with a time delayed input signal for providing a detector output signal. A low frequency component signal of the detector output signal is monitored and a delay control feedback is applied to an adjustable time delay to bias the DC signal of the detector output signal.

Systems and Methods for Combined Binary and Non-Binary Data Processing

Various embodiments of the present invention provide systems and methods for data processing. For example, a data processing system is disclosed that includes a combination data decoder circuit. The combination data decoder circuit includes: a non-binary data decoder circuit and a binary data decoder circuit.

Magnetic head having high-frequency oscillatory elements and disk drive with the same

According to one embodiment, a magnetic head includes a main pole configured to apply a perpendicular recording magnetic field to a recording layer of a recording medium, a return pole opposed to the trailing side of the main pole with a write gap therebetween and configured to reflux magnetic flux from the main pole to form a magnetic circuit in conjunction with the main pole, a coil configured to excite magnetic flux in the magnetic circuit includes the main pole and the return pole, a plurality of high-frequency oscillatory elements individually interposed between the main pole and the return pole, includes a plurality of magnetic films different in magnetic resonance frequency, and configured to individually apply high-frequency magnetic fields to the recording medium, and an electrical circuit configured to energize the high-frequency oscillatory elements.

SPIN CONDUCTION ELEMENT AND MAGNETIC SENSOR AND MAGNETIC HEAD USING SPIN CONDUCTION

A spin conduction element includes a main channel layer having a first electrode, a second electrode, a third electrode, a fourth electrode, a fifth electrode, and a sixth electrode, and extending in a first direction. Spins are injected into the main channel layer from a second ferromagnetic layer constituting the second electrode and a fourth ferromagnetic layer constituting the fourth electrode, and a spin current is detected as a voltage in a third ferromagnetic layer constituting the third electrode. 1. A spin conduction element comprising:a first region, a second region, a third region, a fourth region, and a fifth region provided on a main channel layer extending in a first direction, the regions being arranged in order from one of the sides in the first direction;a first electrode mounted on the first region;a second electrode mounted on the second region;a third electrode mounted on the third region;a fourth electrode mounted on the fourth region; anda fifth electrode mounted on the fifth region,wherein the second electrode includes a second ferromagnetic layer composed of a ferromagnetic material;the third electrode includes a third ferromagnetic layer composed of a ferromagnetic material;the fourth electrode includes a fourth ferromagnetic layer composed of a ferromagnetic material; andthe magnetization directions of the second ferromagnetic layer, the third ferromagnetic layer, and the fourth ferromagnetic layer are the same.2. The spin conduction element according to claim 1 , further comprising:a second channel layer provided in the third region of the channel layer to extend in a second direction different from the first direction on the same plane as the first direction;a sixth region extending in the second direction; anda sixth electrode mounted on the sixth region.3. The spin conduction element according to claim 1 ,wherein the first electrode and the fifth electrode include a first ferromagnetic layer and a fifth magnetic layer, respectively, ...

PRESENTATION OF SHINGLED MAGNETIC RECORDING DEVICE TO A HOST DEVICE RESOURCE MANAGER

A shingled magnetic recording hard drive is presented to a resource manager of a host device as an emulated device such as one or more optical media, an array of sequential access media, and/or write-once, read-many device. Data targeted for the emulated device is written to the shingled magnetic recording hard drive.

Light Source Power Control for Heat Assisted Magnetic Recording (HAMR)

Apparatus and method for light source power control during the writing of data to a storage medium. In accordance with various embodiments, a data recording head is provided having a magnetic transducer and a light source. The light source is driven at a first power level to irradiate an adjacent storage medium prior to the writing if data to the medium using the magnetic transducer. The first power level is insufficient to alter a magnetization state of the medium. The light source is subsequently transitioned to a higher, second power level to irradiate the storage medium during the writing of data to said medium using the magnetic transducer, the second power level being sufficient to alter said magnetization state of the medium.

Monitoring of extent of writing of unobscured data to improve erase performance on a magnetic medium

A system according to one embodiment includes a processor; logic in the processor and/or a memory configured to determine a furthest physical position on a magnetic medium that unobscured data has been written to; and logic configured to store an indicator of the furthest physical position on at least one of the magnetic medium and a memory coupled thereto. A system according to another embodiment includes a processor; logic in the processor and/or a memory configured to receive an instruction to obscure data on a magnetic medium; logic configured to read an indicator of a furthest physical position on the magnetic medium that unobscured data has been written to; and logic configured to cause obscuring of the unobscured data on the magnetic medium, and terminating the obscuring upon reaching the physical position in the indicator.

Over-the-Rail Write Driver for Magnetic Storage Systems

A write driver circuit for generating a write current pulse for use by a magnetic write head includes an output stage adapted for connection with the magnetic write head and a charge storage circuit connected with the output stage. The charge storage circuit is operative in a first mode to store a prescribed charge and is operative in a second mode to transfer at least a portion of the charge stored therein to the output stage to thereby enable an output voltage level of the output stage to extend beyond a voltage supply rail of the write driver circuit. A control circuit in the write driver circuit is operative to generate at least one control signal for selectively controlling a mode of operation of the charge storage circuit.

PRE-AMPLIFIER OUTPUT STAGE WITH INTEGRATED TEST BUFFER

Disk drive pre-amplifier output stage circuitry is presented including a high pass input filter for removing DC offsets from differential read data signals and providing an input to AB drivers of the output stage, in which an offset test circuit selectively drives the high pass filter output nodes according to the offset at the filter input to facilitate measurement of the preceding circuit offset at the driver output terminals, and a common mode regulator circuit regulates common mode voltages at the first and second driver output nodes to a predetermined value in read and write modes. 1. A pre-amplifier output stage for a pre-amplifier of a disk drive system , the output stage comprising: a first capacitor connected between the first filter input and the first filter output node,', 'a first filter resistance connected between the first filter output node and a filter rail node,', 'a second capacitor connected between the second filter input and the second filter output node, and', 'a second filter resistance connected between the second filter output node and the filter rail node;, 'a high pass filter circuit with first and second filter inputs that receive a differential input from a pre-amplifier gain stage, the high pass filter circuit providing a differential filter output to first and second filter output nodes, the high pass filter circuit comprisinga driver circuit, comprising first and second driver inputs connected to the first and second filter output nodes and providing a differential driver output at first and second driver output nodes;a reference generator circuit providing a reference voltage; a transconductance amplifier with a first input connected to the reference voltage, a second input, and an output connected to the filter rail node,', 'a first feedback resistor connected between the second input of the transconductance amplifier and the first driver output node, and', 'a second feedback resistor connected between the second input of the ...

RESISTIVE TEMPERATURE SENSORS FOR IMPROVED ASPERITY, HEAD-MEDIA SPACING, AND/OR HEAD-MEDIA CONTACT DETECTION

A sensor supported by a head transducer has a temperature coefficient of resistance (TCR) and a sensor resistance. The sensor operates at a temperature above ambient and is responsive to changes in sensor-medium spacing. Conductive contacts connected to the sensor have a contact resistance and a cross-sectional area adjacent to the sensor larger than that of the sensor, such that the contact resistance is small relative to the sensor resistance and negligibly contributes to a signal generated by the sensor. A multiplicity of head transducers each support a TCR sensor and a power source can supply bias power to each sensor of each head to maintain each sensor at a fixed temperature above an ambient temperature in the presence of heat transfer changes impacting the sensors. A TCR sensor of a head transducer can include a track-oriented TCR sensor wire for sensing one or both of asperities of the medium. 125-. (canceled)26. An apparatus , comprising:a plurality of head transducers configured to interact with magnetic recording media;a plurality of sensors having a temperature of coefficient of resistance, wherein at least one sensor is provided on each head transducer and is responsive to changes in spacing between the sensor and the media; anda power source configured to supply bias power to each sensor of each head transducer and to adjust the bias power to maintain each sensor at a fixed temperature above an ambient temperature in the presence of heat transfer changes impacting the sensors.27. The apparatus of claim 26 , wherein the fixed temperature is a temperature above an ambient temperature.28. The apparatus of claim 26 , further comprising:a heater provided at each of the head transducers and configured to actuate the head transducers;wherein the power source is configured to adjust the bias power to maintain each sensor at the fixed temperature in the presence of heat transfer changes impacting the sensors including those due to power supplied to the heater. ...

CURRENT-PERPENDICULAR-TO-PLANE GIANT MAGNETORESISTIVE ELEMENT, PRECURSOR THEREOF, AND MANUFACTURING METHOD THEREOF

Provided is a precursor of a current-perpendicular-to-plane giant magnetoresistive element having a laminated structure of ferromagnetic metal layer/nonmagnetic metal layer/ferromagnetic metal layer, the precursor having a nonmagnetic intermediate layer containing a non-magnetic metal and an oxide in a predetermined ratio such that the distribution thereof is nearly uniform at the atomic level. Also provided is a current-perpendicular-to-plane giant magnetoresistive element having a current-confinement structure (CCP) which has: a current confinement structure region made of a conductive alloy and obtained by heat-treating a laminated structure of a ferromagnetic metal layer and a nonmagnetic intermediate layer at a predetermined temperature; and a high-resistance metal alloy region containing an oxide and surrounding the current confinement structure region. 1. A precursor of a current-perpendicular-to-plane giant magnetoresistance element having a laminate structure of a ferromagnetic metal layer/a non-magnetic metal layer/a ferromagnetic metal layer , comprisingthe non-magnetic spacer layer containing a non-magnetic metal and an oxide at a predetermined ratio and containing the non-magnetic metal and the oxide in a roughly uniform manner at an atomic level.2. The precursor of a current-perpendicular-to-plane giant magnetoresistance element according to claim 1 , whereinthe non-magnetic metal is at least one substance selected from among Cu, Ag, Au and an alloy thereof, and{'sub': 2', '3', '2', '2', '3, 'the oxide is at least one substance selected from among InO, ZnO, SnO, GaO, and a mixture thereof.'}3. The precursor of a current-perpendicular-to-plane giant magnetoresistance element according to claim 2 , whereinthe non-magnetic metal is Ag,{'sub': 2', '3, 'the oxide is InZnO (a mixture of InOand ZnO), and'}the precursor of a current-perpendicular-to-plane giant magnetoresistance element comprises the non-magnetic spacer layer consisting of a AgInZnO single- ...

Data storage device and system having adaptive brownout detection

Technologies are described herein for adaptive brownout detection and mitigation in a storage device having rotational storage media. A target position on the rotational storage media for a current write operation is received. A value for a brownout mitigation parameter is determined based on the target position. A brownout condition is then detected on the storage device, and upon detecting the brownout condition, the current write operation is completed before a power-on reset of the storage device.

On head microelectronics for write synchronization

The presently disclosed technology teaches integrating disc drive electronics into a transducer head. Decreased electrical transit times and data processing times can be achieved by placing the electronics on or within the transducer head because electrical connections may be made physically shorter than in conventional systems. The electronics may include one or more of a control system circuit, a write driver, and/or a data buffer. The control system circuit generates a modified clock signal that has a fixed relation to phase and frequency of a bit-detected reference signal that corresponds to positions of patterned bits on the disc. The write driver writes outgoing data bits received from an external connection to off-head electronics directly to the writer synchronized with the modified clock signal. The data buffer stores and converts digital data bits sent from the off-head electronics to an analog signal that is synchronized with the modified clock signal.

Pin-efficient reader bias enable control

Systems and methods are included for determining a presence of an upcoming reading field during a write mode of a storage device, and initiating a read-while write (RWW) mode of the storage device in response to the sensed reading field. Initiating the RWW mode comprises warming up the reader circuitry, generating a signal in response to an end to the write operation, and activating reader bias current in response to the generated signal.

COMPOSITE HEAT ASSISTED MAGNETIC RECORDING MEDIA WITH ANISOTROPY FIELD AND CURIE TEMPERATURE GRADIENT

An apparatus is disclosed. The apparatus includes a first write layer, a second write layer, and a storage layer. The first write layer is disposed over the storage layer. The second write layer is disposed over the first write layer. The anisotropy field of the storage layer is greater than anisotropy field of the first write layer. The anisotropy field of the first write layer is greater than anisotropy field of the second write layer. The Curie temperature of the second write layer is greater than the Curie temperature of the first write layer. The Curie temperature of the first write layer is greater than a Curie temperature of the storage layer. 1. An apparatus comprising:a storage layer;a first write layer disposed over the storage layer; anda second write layer disposed over the first write layer,wherein an anisotropy field of the storage layer is greater than an anisotropy field of the first write layer and wherein the anisotropy field of the first write layer is greater than an anisotropy field of the second write layer,wherein a Curie temperature of the second write layer is greater than a Curie temperature of the first write layer, and wherein the Curie temperature of the first write layer is greater than a Curie temperature of the storage layer.2. The apparatus of claim 1 , wherein a material of the storage layer includes FePt.3. The apparatus of claim 1 , wherein a material of the first write layer is selected from a group consisting of FePtX claim 1 , FeCoPtY claim 1 , FePdX claim 1 , FeCoPdY claim 1 , CoPtZ claim 1 , CoCrPtXX claim 1 , and FeCoYY wherein X claim 1 , Y claim 1 , Z claim 1 , XX claim 1 , and YY is selected from a group consisting of Cu claim 1 , Ag claim 1 , Ni claim 1 , Ru claim 1 , Rh claim 1 , and Mn and wherein a material of the second write layer is selected from a group consisting of FePtX claim 1 , FeCoPtY claim 1 , FePdX claim 1 , FeCoPdY claim 1 , CoPtZ claim 1 , CoCrPtXX claim 1 , and FeCoYY wherein X claim 1 , Y claim 1 , Z ...

DISK DEVICE

According to one embodiment, in a disk device, a first pattern cut out from a burst region at a certain servo track by a first length and with a first start position, does not match a second pattern cut out from the burst region at an adjacent servo track by the first length and with an arbitrary second start position including first timing. The burst region at the servo tracks includes a first burst pattern including a first magnetized portion where a first value is recorded and a second magnetized portion where a second value reverse to the first value in polarity is recorded, the second magnetized portion being adjacent to the first magnetized portion in a down track direction. A width of the first magnetized portion in the down track direction and a width of the second magnetized portion in the down track direction are different from each other. 2. The disk device according to claim 1 , wherein a third magnetized portion where the second value is recorded, the third magnetized portion being adjacent to the first magnetized portion in a cross track direction, and', 'a fourth magnetized portion where the first value is recorded, the fourth magnetized portion being adjacent to the third magnetized portion in the down track direction, and, 'the first burst pattern further includes'}a border line between the first magnetized portion and the second magnetized portion and a border line between the third magnetized portion and the fourth magnetized portion are present along a straight line extending in the cross track direction.3. The disk device according to claim 2 , whereina width of the third magnetized portion in the down track direction and a width of the fourth magnetized portion in the down track direction are different from each other.4. The disk device according to claim 1 , whereinthe burst region at the servo tracks further includes a second burst pattern, a fifth magnetized portion where the first value is recorded, the fifth magnetized portion being ...

Tape damage detection

In one general embodiment, a method includes calculating a differential position value based on readback signals from at least two servo readers of a magnetic head reading servo tracks of a magnetic recording tape. The differential position value is compared to a previously-calculated differential position value. An action is performed in response to determining that the difference between the differential position value and the previously-calculated differential position value is in a predefined range. In another general embodiment, an apparatus includes a magnetic head having at least two servo readers, and a controller in communication with the servo readers. The controller is configured to detect a sudden change in a width of a magnetic recording tape based on a differential position value derived from relatively more current servo readback data and a second differential position value derived from relatively older servo readback data.

READING NARROW DATA TRACKS WITH MULTIPLE WIDE READERS

Technologies are described herein for utilizing multiple, wide readers to read narrow data tracks on a magnetic recording media in a storage device. A system for reading a data track on a magnetic recording media comprises a plurality of reader elements, the width of each reader element being an integer greater than 1 multiple of a width of the data tracks on the recording media. The system further comprises a multi-reader decoder module operably connected to the plurality of reader elements. Each of the reader elements is configured to read a magnetic signal from the magnetic recording media. The multi-reader decoder module is configured to receive a read signal from each of the reader elements, and decode the data on the data track based on the read signals from the reader elements. 1. A system for reading a data track on magnetic recording media , the system comprising:{'b': '1', 'a read/write head comprising a plurality of reader elements configured to read a magnetic signal from the magnetic recording media, a width of each of the plurality of reader elements being an integer greater than multiple of a width of the data track on the recording media; and'}a multi-reader decoder module operably connected to the read/write head and configured toreceive a read signal from each of the plurality of reader elements, anddecode the data on the data track based on the read signals from the plurality of reader elements.2. The system of claim 1 , wherein the read signals indicate a summation of data on the data track and one or more adjacent tracks.3. The system of claim 1 , wherein each of the plurality of reader elements has a different alignment over the data track.4. The system of claim 1 , wherein the multi-reader decoder module comprises:a plurality of multi-level detectors, each of the multi-level detectors configured to detect multiple levels in the read signals and generate an associated multi-level value; anda mapper configured to convert the multi-level values ...

Thermal-assisted magnetic recording device capable of writing magnetic patterns on lower multi-step driving signals

According to one embodiment, there is provided a magnetic disk device including a light irradiation element and a control unit. The light irradiation element is configured to irradiate a magnetic disk with light according to a driving signal. The control unit is configured to lower, in multistep manner, active level of the driving signal contributing intensity of the light when a low frequency pattern of write data is recorded into the magnetic disk.

Method and apparatus for speed control of voice coil motor retract operation dependent upon available power

The back EMF (B EMF ) of a motor is sensed and compared to a target back EMF (B EMF ) to generate an error control signal. The circuit supply voltage is also sensed. A PWM motor control signal is generated in response to a comparison of the error control signal to a ramp signal having a variable slope. The variable slope is selected in response to the sensed circuit supply voltage. The motor is then driven in response to the PWM control signal. The sign of the error control signal is used to selectively short one of motor terminals to a reference voltage supply node while the other motor terminal is driven in response to the PWM control signal.

Laser optical power monitoring using thermal sensor of a head transducer

A light source is configured to produce light, a waveguide is optically coupled to the light source and configured to direct the light to an intended focus location, and a slider is configured to use the light as an energy source for heating a region of a magnetic recording medium. A thermal sensor is situated on the slider at a location outside of a light path that includes the intended focus location. The thermal sensor is configured for sensing a short time constant change in temperature resulting from light source heating of the thermal sensor, wherein the sensed change in thermal sensor temperature is representative of optical intensity of the light delivered to the intended focus location.

Data Removal Drill Device and Method to Use

This unique and novel invention provides a custom data removal jig used to reliably, efficiently, and cost-effectively remove data from a handheld mobile computing device (“PC device”). The data removal jig comprises an open-box structure which provides one or more alignment features to assist with properly inserting the PC device within the data removal jig. Additionally, a pilot hole is provided by the securement structure. Once the PC device is inserted into the data removal jig, the pilot hole is substantially centered above the integrated flash memory chip on the particular PC device's motherboard which the data removal jig has been customized to accommodate. A power drill is used to precisely penetrate the PC device via the pilot hole and substantially isolate the damage to the integrated flash memory chip. Additionally, the securement structure also provides one or more braces that assist with restraining movement of the securement structure during the data removal process. 1. A data removal jig comprising: wherein the securement structure further comprises a plurality of sides;', 'wherein the plurality of sides includes a top side, a bottom side, a rear side, a front side, and a pair of end sides;', 'wherein the top side, the bottom side, and the pair of end sides each comprise an interior surface and an exterior surface;', 'wherein the distance between the interior surfaces of the pair of end sides and the distance between the interior surfaces of the top and bottom sides form an interior void within the securement structure;, 'a. a securement structure;'} 'wherein the insert opening is provided in the securement structure;', 'b. an insert opening;'} 'wherein the alignment hole is provided in the top side of the securement structure;', 'c. an alignment hole;'} 'wherein the pilot hole is provided in the top side of the securement structure;', 'd. a pilot hole;'} 'wherein the lateral brace is provided in the bottom side of the securement structure.', 'e. a ...

MAGNETIC DISK DEVICE AND REWRITE PROCESSING METHOD

According to one embodiment, a magnetic disk device includes a disk having a first region in which a plurality of tracks is written and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction, a head, and a controller that offsets part of a plurality of tracks which is overwritten in the second region in a second direction opposite the first direction to perform rewriting. 1. A magnetic disk device comprising:a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction;a head that writes data to the disk and that reads data from the disk; anda controller that offsets part of a plurality of tracks which is overwritten in the second region in a second direction opposite the first direction to perform rewriting.2. The magnetic disk device according to claim 1 , whereinwhen rewriting part or all of data in the second initial track, the controller offsets the second initial track from a first position to a second position away from the first position by a first interval in the second direction to perform rewriting.3. The magnetic disk device according to claim 1 , whereinwhen rewriting first data in the second region, the controller offsets a plurality of tracks which is continuously overwritten in the first direction from the second initial track to a first track including the first data by a first interval ...

MAGNETIC DISK DEVICE AND READ RETRY PROCESSING METHOD

According to one embodiment, a magnetic disk device including a first disk, a second disk, a first head operable to write data to the first disk and read data from the first disk, a second head operable to write data to the second disk and read data from the second disk, a first actuator including the first head, a second actuator including the second head, a first controller operable to control the first head and the first actuator, and a second controller operable to control the second head and the second actuator, wherein the first controller transfers first data in which a read error occurs to the second controller, and the second controller applies a read retry process to the first data transferred from the first controller. 1. A magnetic disk device comprising:a first disk;a second disk;a first head operable to write data to the first disk and read data from the first disk;a second head operable to write data to the second disk and read data from the second disk;a first actuator comprising the first head;a second actuator comprising the second head;a first controller operable to control the first head and the first actuator; anda second controller operable to control the second head and the second actuator, whereinthe first controller transfers first data in which a read error occurs to the second controller, andthe second controller applies a read retry process to the first data transferred from the first controller.2. The magnetic disk device of claim 1 , whereinthe first controller comprises a first read channel comprising a first memory,the second controller comprises a second read channel comprising a second memory, andwhen the second read channel is in an idle state, the first read channel copies the first data from the first memory to the second memory.3. The magnetic disk device of claim 2 , further comprising a buffer memory connected to the first controller claim 2 , whereinthe first read channel copies the first data from the first memory to the ...

Spin Injection Assisted Magnetic Recording

A spin injection assisted magnetic recording structure is disclosed wherein a ferromagnetic (FM) layer and at least one spin preservation (SP) layer are formed between a main pole (MP) trailing side and a write shield (WS). Current (Ia) flows between the MP and WS, or is injected into the FM layer. As a result, the spin polarized electrons from the FM layer, which flow across one or two SP layers to generate a magnetization that enhances one or both of a local WS magnetization and return field, and a local MP magnetization and write field, respectively. A lead to the FM layer may be stitched to enable lower resistance and improve reliability. The FM layer may be recessed from the ABS to allow more overlap with the SP layer for lower current density while maintaining performance. Higher linear density and area density capability, and better reliability are achieved. 1. A spin injection assisted magnetic recording (SIAMR) structure , comprising:(a) a main pole (MP) that is configured to generate a magnetic (write) field which is directed orthogonal to an air bearing surface (ABS) and through a MP tip at the ABS;(b) a write shield (WS) with a side at the ABS through which a return field passes orthogonal to the ABS, and having a bottom surface that faces a MP trailing side; and{'claim-text': ['(1) a ferromagnetic (FM) layer having a magnetization substantially in a direction of a WG field flux between the MP and WS;', '(2) a spin preservation (SP) layer that adjoins a first side of the FM layer, and is either the first layer that conducts spin polarized current from the FM layer into the WS at the WS bottom surface, or is the second layer that conducts spin polarized current from the FM layer into the MP trailing side, and wherein the SIAMR stack of layers is configured so that when a current (Ia) is injected from a source into the FM layer, spin polarized electrons flow across the SP layer to generate a magnetization proximate to the MP trailing side that enhances a ...

Spin Injection Assisted Magnetic Recording

A spin injection assisted magnetic recording structure is disclosed wherein a ferromagnetic (FM) layer and at least one spin preservation (SP) layer are formed between a main pole (MP) trailing side and a write shield (WS). Current (Ia) flows between the MP and WS, or is injected into the FM layer. As a result, the spin polarized electrons from the FM layer, which flow across one or two SP layers to generate a magnetization that enhances one or both of a local WS magnetization and return field, and a local MP magnetization and write field, respectively. A lead to the FM layer may be stitched to enable lower resistance and improve reliability. The FM layer may be recessed from the ABS to allow more overlap with the SP layer for lower current density while maintaining performance. Higher linear density and area density capability, and better reliability are achieved. 1. A spin injection assisted magnetic recording (SIAMR) structure , comprising:(a) a main pole (MP) that is configured to generate a magnetic (write) field which is directed orthogonal to an air bearing surface (ABS) and through a MP tip at the ABS;(b) a write shield (WS) with a side at the ABS through which a return field passes orthogonal to the ABS, and having a bottom surface that faces a MP trailing side; and (1) a ferromagnetic (FM) layer having a magnetization substantially in a direction of a WG field flux between the MP and WS;', '(2) a spin preservation (SP) layer that adjoins a first side of the FM layer, and is either the first layer that conducts spin polarized current from the FM layer into the WS at the WS bottom surface, or is the second layer that conducts spin polarized current from the FM layer into the MP trailing side, and wherein the SIAMR stack of layers is configured so that when a current (Ia) is injected from a source into the FM layer through a lead that excludes the MP and TS, spin polarized electrons flow across the SP layer to generate a magnetization proximate to the MP ...

MAGNETIC HEAD AND MAGNETIC RECORDING DEVICE

According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a first magnetic layer provided between the magnetic pole and the first shield, a second magnetic layer provided between the first magnetic layer and the first shield, and an intermediate layer provided between the first magnetic layer and the second magnetic layer. The intermediate layer is nonmagnetic. A first distance between the magnetic pole and the first magnetic layer along a first direction is not less than 1% and not more than 10% of a second distance between the magnetic pole and the first shield along the first direction. The first direction is from the first magnetic layer toward the second magnetic layer. 1. A magnetic recording device , comprising:a magnetic head; anda magnetic recording medium, information being recorded in the magnetic recording medium by the magnetic head, a magnetic pole;', 'a first shield;', 'a first magnetic layer provided between the magnetic pole and the first shield;', 'a second magnetic layer provided between the first magnetic layer and the first shield; and', 'an intermediate layer provided between the first magnetic layer and the second magnetic layer, the intermediate layer being nonmagnetic,', 'a first distance between the magnetic pole and the first magnetic layer along a first direction being not less than 1% and not more than 10% of a second distance between the magnetic pole and the first shield along the first direction, the first direction being from the first magnetic layer toward the second magnetic layer,, 'wherein the magnetic head compriseswherein a shortest bit length of the magnetic recording medium is not less than 0.5 times and not more than 0.78 times a third distance between the first magnetic layer and the first shield along the first direction.2. The magnetic device according to claim 1 , wherein the first distance is not less than 1 nm and not more than 4 nm.3. The magnetic device according to claim 1 , further ...

MAGNETIC HEAD AND MAGNETIC RECORDING DEVICE

According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a first magnetic layer, a second magnetic layer, a third magnetic layer, a first intermediate layer, a second intermediate layer, a third intermediate layer, and a fourth intermediate layer. The first magnetic layer is provided between the magnetic pole and the first shield. The second magnetic layer is provided between the first magnetic layer and the first shield. The third magnetic layer is provided between the second magnetic layer and the first shield. The first intermediate layer is provided between the magnetic pole and the first magnetic layer. The second intermediate layer is provided between the first magnetic layer and the second magnetic layer. The third intermediate layer is provided between the second magnetic layer and the third magnetic layer. The fourth intermediate layer is provided between the third magnetic layer and the first shield. 1. A magnetic head , comprising:a magnetic pole;a first shield;a first magnetic layer provided between the magnetic pole and the first shield;a second magnetic layer provided between the first magnetic layer and the first shield;a third magnetic layer provided between the second magnetic layer and the first shield;a first intermediate layer provided between the magnetic pole and the first magnetic layer, the first intermediate layer including at least one selected from a first group consisting of Au, Cu, Ag, Al, and Ti;a second intermediate layer provided between the first magnetic layer and the second magnetic layer, the second intermediate layer including at least one selected from a second group consisting of Ta, Ir, W, Mo, Cr, Tb, Rh, and Pd;a third intermediate layer including at least one selected from the first group and being provided between the second magnetic layer and the third magnetic layer; anda fourth intermediate layer including at least one selected from the second group and being provided between the third ...

Magnetic Recording Devices Using Virtual Side Shields for Improved Areal Density Capability

Embodiments of the present disclosure generally relate to a magnetic media drive employing a magnetic recording device. The magnetic recording device comprises a trailing gap disposed adjacent to a first surface of a main pole, a first side gap disposed adjacent to a second surface of the main pole, a second side gap disposed adjacent to a third surface of the main pole, and a leading gap disposed adjacent to a fourth surface of the main pole. A side shield surrounds the main pole and comprises a heavy metal first layer and a magnetic second layer. The first layer surrounds the first, second, and third surfaces of the main pole, or the second, third, and fourth surfaces of the main pole. The second layer surrounds the second and third surfaces of the main pole, and may further surround the fourth surface of the main pole.

MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING/REPRODUCTION APPARATUS

According to one embodiment, a magnetic recording medium includes a magnetic recording layer formed on a substrate and including magnetic grains and a grain boundary formed between the magnetic grains, the grain boundary includes a first grain boundary having a first thermal conductivity, and a second grain boundary formed on the first grain boundary and having a second thermal conductivity different from the first thermal conductivity, and at least one of the first and second grain boundaries suppresses thermal conduction. 1. A magnetic recording medium comprising:a substrate; anda magnetic recording layer formed on the substrate, and comprising magnetic grains and a grain boundary formed between the magnetic grains,wherein the grain boundary comprises a first grain boundary having a first thermal conductivity, and a second grain boundary formed on the first grain boundary and having a second thermal conductivity different from the first thermal conductivity, and at least one of the first grain boundary and the second grain boundary is configured to suppress thermal conduction.2. The medium of claim 1 , further comprising a heat-sink layer between the substrate and the magnetic recording layer.3. The medium of claim 2 , wherein the heat-sink layer contains at least one material selected from the group consisting of silver claim 2 , copper claim 2 , gold claim 2 , and alloys thereof.4. The medium of claim 2 , further comprising a thermal barrier layer between the heat-sink layer and the magnetic recording layer.5. The medium of claim 4 , wherein the thermal barrier layer contains ZrO.6. The medium of claim 1 , wherein the magnetic grains are selected from the group consisting of an iron-platinum alloy having an L1structure claim 1 , a cobalt-platinum alloy having the L1structure claim 1 , and a multilayered film of cobalt and platinum.7. The medium of claim 1 , wherein each of the first grain boundary and the second grain boundary is selected from a layer made of at ...

ON HEAD MICROELECTRONICS FOR WRITE SYNCHRONIZATION

The presently disclosed technology teaches integrating disc drive electronics into a transducer head. Decreased electrical transit times and data processing times can be achieved by placing the electronics on or within the transducer head because electrical connections may be made physically shorter than in conventional systems. The electronics may include one or more of a control system circuit, a write driver, and/or a data buffer. The control system circuit generates a modified clock signal that has a fixed relation to phase and frequency of a bit-detected reference signal that corresponds to positions of patterned bits on the disc. The write driver writes outgoing data bits received from an external connection to off-head electronics directly to the writer synchronized with the modified clock signal. The data buffer stores and converts digital data bits sent from the off-head electronics to an analog signal that is synchronized with the modified clock signal. 1. An apparatus comprising:an on-head bit detector located on a transducer head and configured to detect a reference signal corresponding to bit locations on a storage media; andon-head control system circuitry integrated within the transducer head and configured to synchronize a clock signal with the bit-detected reference signal to generate a modified clock signal synchronized with the bit locations on a storage device.2. The apparatus of claim 1 , wherein the control system circuitry includes a phase-locked loop circuit.3. The apparatus of claim 1 , wherein the data is in a digital signal and a data buffer of the on-head control system circuitry is configured to convert the digital data to an analog data signal that is incorporated into the modified clock signal.4. The apparatus of claim 1 , wherein the modified clock signal is generated by passing a phase difference between the bit-detected reference signal and the clock signal through an on-head low pass filter to generate a DC bias and the DC bias is ...

DISK-DRIVE WITH EFFICIENT COMMAND-REORDERING

A storage device includes a disk, a head configured to write data to and read data from the disk, and a controller. The controller is configured to, for each of a plurality of unexecuted commands, carry out a calculation of an amount of time that is required for the head to start accessing the disk to begin execution of the non-executed command upon completion of a currently-executed command, until the earlier of i) a number of unexecuted commands for which the calculation has been carried out reaches a threshold value or ii) the completion of the currently-executed command, select a next command to be executed from one or more unexecuted commands for which the calculation has been carried out, based on the calculated amount of time for each of the one or more unexecuted commands, and execute the selected next command. 1. (canceled)2. A storage device comprising:a disk;a head configured to write data to and read data from the disk; and divide a logical address range that corresponds to physical locations of the disk into a first sub-range that corresponds to one of an outer or inner diameter region of the disk, a second sub-range that corresponds to the other one of the outer or inner diameter region of the disk, and a plurality of third sub-ranges that correspond to physical locations of the disk that are between the outer and inner diameter regions of the disk,', 'classify each of a plurality of unexecuted commands into one of the sub-ranges according to a logical address designated by the unexecuted command,', 'while a command is being executed, perform reordering of the unexecuted commands classified into one of the sub-ranges and determine a total number of unexecuted commands that have been reordered while the command is being executed, and', 'when the sub-range for which the reordering is being performed is the first sub-range and a next sub-range for which the reordering is to be performed is the second sub-range and when the total number of unexecuted ...

DISK DEVICE THAT UPDATES WRITE COUNTS OF TRACKS BASED ON A HEAD OFFSET DURING WRITING OF ADJACENT TRACKS

A disk device includes a magnetic disk, a head configured to write data into the magnetic disk, a memory in which a write count and a offset amount of the head during a write operation are stored for each of a plurality of tracks of the magnetic disk, and a processor. The processor is configured to determine an inner offset and an outer offset of the head with respect to a target track of a write operation, and update the write count for an adjacent inner track of the target track based on the inner offset, and the write count for an adjacent outer track of the target track based on the outer offset. 1. A disk device comprising:a magnetic disk;a head configured to write data onto the magnetic disk;a memory in which a write count and an offset amount of the head during a write operation are stored for each of a plurality of tracks of the magnetic disk; and determine an inner offset and an outer offset of the head with respect to a target track of a write operation, and', 'update the write count for an adjacent inner track of the target track based on the inner offset, and the write count for an adjacent outer track of the target track based on the outer offset., 'a processor configured to'}2. The disk device according to claim 1 , whereinthe processor is further configured to update the offset amount of the target track to a larger value of the inner offset and the outer offset, when the larger value is greater than the offset amount of the target track stored in the memory.3. The disk device according to claim 1 , whereinthe processor is further configured to carryout a refresh operation of rewriting data stored in a track when the write count of the track, which is stored in the memory, is greater than a threshold.4. The disk device according to claim 1 , whereinthe write count for the adjacent inner track is updated by incrementing an amount calculated based on a weighting coefficient, the offset amount of the adjacent inner track stored in the memory, and the ...

Writer with Narrower High Moment Trailing Shield

A PMR (perpendicular magnetic recording) write head configured for microwave assisted magnetic recording (MAMR) in the form of spin assisted writing (SAW) or spin torque oscillation (STO) includes a spin-torque oscillator (STO) or SAW device and trailing shield formed of high moment magnetic material (HMTS). By patterning the STO or SAW and the HMTS in a simultaneous process the HMTS and the STO or SAW layers are precisely aligned and have very similar cross-track widths. In addition, the write gap at an off-center location has a thickness that is independent from its center-track thickness and the write gap total width can have a flexible range whose minimum value is the same width as the STO or SAW width. 1. A perpendicular magnetic writer (PMR) configured for microwave assisted magnetic recording (MAMR) , comprising:a magnetic main pole (MP) emerging at an air-bearing surface (ABS) and having a trapezoidal ABS face that is wider at a trailing edge surface than at a leading-edge surface and wherein said trailing and leading-edge surfaces are connected by symmetrically formed side edge surfaces;a dielectric layer conformally surrounding said MP and forming a uniform gap between both side edge surfaces of said MP and said leading edge surface of said MP; whereinsaid dielectric layer has an upper planar surface that is coplanar with said trailing edge surface of said MP and that extends symmetrically away from said MP from said uniform gaps;a spin-assisted writing device (SAW) formed on the trailing edge side of said MP and having the same width as said trailing edge side and aligned with it; whereinsaid SAW is configured to provide a magnetization against the direction of a gap field and, thereby, enhance the magnetic field of said MP when said magnetic field is impinging on a recording media;a high-moment trailing shield (HMTS) formed on said SAW layer and having the same width of said SAW layer and aligned with it;a write gap (WG) layer formed on said upper planar ...

Magnetic recording and reproducing device and method of controlling magnetic recording and reproducing device

According to one embodiment, a magnetic recording and reproducing device which has a magnetic recording medium, a magnetic head, and a recording current output unit. Magnetic data is recorded on the magnetic recording medium. The magnetic head records the magnetic data on the magnetic recording medium. The recording current output unit supplies a recording current to the magnetic head so as to magnetize the magnetic head. A waveform of the recording current has a first slope for a first period to record data of first information continuously and a second slope for a following second period to switch the data to data of second information and to record the data of the second information. The first slope and the second slope are different from each other.

Skyrmion generation device, skyrmion generation method, and magnetic memory device

A skyrmion generation method capable of reducing power consumption in generating skyrmions is provided. In the skyrmion generation method, an electric field is applied to an insulating magnetic body having a chiral crystal structure locally using an electric field generation unit while a magnetic field is applied from a magnetic field generation unit to the magnetic body. As a result, a skyrmion is generated in the magnetic body. The magnetic body preferably has a thin film shape with a thickness in a range of 2 to 300 nm at least partially, and the magnetic field generation unit preferably applies the magnetic field to a surface of the magnetic body substantially perpendicularly.

Magnetic Recording Devices Having Negative Polarization Layer To Enhance Spin-Transfer Torque

Aspects of the present disclosure generally relate to a magnetic recording head of a spintronic device, such as a write head of a data storage device, for example a magnetic media drive. In one example, a magnetic recording head includes a main pole, a trailing shield, and a spin torque layer (STL) between the main pole and the trailing shield. The magnetic recording head a first layer structure on the main pole, and the first layer structure includes a negative polarization layer. The magnetic recording head also includes a second layer structure disposed on the negative polarization layer and between the negative polarization layer and the STL. The negative polarization layer is an FeCr layer. The second layer structure includes a Cr layer disposed on the FeCr layer, and a Cu layer disposed on the Cr layer and between the Cr layer and the STL. 1. A magnetic recording head , comprising:a main pole;a trailing shield;a spin torque layer (STL) disposed between the main pole and the trailing shield; and [ a first layer disposed on the STL; and', 'a second layer disposed on the first layer; and, 'a first layer structure disposed on the STL, wherein the first layer structure comprises, 'a second layer structure disposed on the first layer structure, where the second layer structure comprises a negative polarization layer., 'a multilayer structure disposed between the STL and the trailing shield, the multilayer structure comprising2. The magnetic recording head of claim 1 , further comprising a spacer layer disposed between the main pole and the STL.3. The magnetic recording head of claim 1 , wherein the second layer structure comprises a ferromagnetic layer.4. The magnetic recording head of claim 3 , wherein the ferromagnetic layer is disposed on a Cu layer.5. The magnetic recording head of claim 1 , wherein the negative polarization layer comprises one or more of Fe claim 1 , Cr claim 1 , N claim 1 , Co claim 1 , or Gd.6. The magnetic recording head of claim 1 , wherein ...

MAGNETIC HEAD AND MAGNETIC RECORDING DEVICE

According to one embodiment, a magnetic recording device includes a magnetic head, and an electrical circuit. The magnetic head includes a magnetic pole, a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first magnetic layer, a second magnetic layer, a first layer provided between the first and second magnetic layers, and a first nonmagnetic layer provided between the first magnetic layer and the first layer. A change rate of an electrical resistance of the stacked body with respect to a change of a current density flowing in the stacked body has a first value when the current density is in a first range, a second value when the current density is in a second range, and a third value when the current density is in a third range. 1. A magnetic recording device , comprising:a magnetic head; andan electrical circuit, a magnetic pole,', 'a first shield, and', 'a stacked body provided between the magnetic pole and the first shield,, 'the magnetic head including'} a first magnetic layer,', 'a second magnetic layer,', 'a first layer provided between the first magnetic layer and the second magnetic layer, the first layer including at least one selected from the group consisting of Ta, Zr, Hf, Mo, W, Tc, Re, Ru, Rh, Os, Ir, Pd, Pt, Mn, Cr, V, Ti, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, and', 'a first nonmagnetic layer provided between the first magnetic layer and the first layer,, 'the stacked body including'} a first value when the current density is in a first range,', 'a second value when the current density is in a second range, and', 'a third value when the current density is in a third range,, 'a change rate of an electrical resistance of the stacked body with respect to a change of a current density flowing in the stacked body has'}the second range being between the first range and the third range, the second value being greater than the first value and greater than ...

Heat-assisted magnetic recording device incorporating laser diode temperature control using common-mode voltage

An apparatus comprises a slider configured to facilitate heat assisted magnetic recording. The slider comprises a plurality of bond pads including a first electrical bond pad, a second electrical bond pad, and a ground pad. A laser diode comprises an anode coupled to the first electrical bond pad and a cathode coupled to the second electrical bond pad. The laser diode is operable in a non-lasing state and a lasing state. A heater is coupled between the ground pad and at least one of the anode and cathode of the laser diode. The heater is configured to generate heat for heating the laser diode during the non-lasing state and the lasing state.

Voice coil motor temperature sensing circuit to reduce catastrophic failure due to voice coil motor coil shorting to ground

An electrical circuit includes: a controlled switch; one or more temperature sensors in thermal contact with the controlled switch; and a control unit configured to: receive a temperature signal from the one or more temperature sensors; compare the received temperature signal to a predetermined threshold; and in response to the received temperature signal exceeding the predetermined threshold, render the controlled switch inoperative.

DELETING FILES WRITTEN ON TAPE

A method for writing a file from an application of a host onto a tape includes sequentially receiving records forming the file from the application, adding a predetermined number of segments of dummy data (dummy records) subsequently to the plurality of records forming the file such that the records of the file and records of a subsequent file are not included in the same data set, interposing the dummy records between a final record of the file and a head record of the subsequent (next) file, to thereby construct at least one data set that is adjacent to one data set and does not include the records of the file, and writing a data set including the records of the file, a data set (dummy data set) including the final record of the file and the dummy records, and a data set including the subsequent file, onto the tape. 1. A method comprising:sequentially receiving a plurality of records forming a file from an application;adding a predetermined number of segments of dummy data subsequently to the plurality of records forming the file such that the records of the file and records of a subsequent file are not included in the same data set;interposing the dummy data between a final record of the file and a head record of the subsequent file to construct at least one data set that is adjacent to one data set and does not include the records of the file; andwriting a data set including the records of the file, a data set including the final record of the file and the dummy records, and a data set including the subsequent file, onto a tape.2. The method of claim 1 , wherein adding a predetermined number of segments of dummy data includes receiving the dummy data as the predetermined number of dummy records from the application.3. The method of claim 1 , wherein a head record of the file corresponds to a head portion of the data set.4. The method of claim 1 , wherein the predetermined number of segments of dummy data are determined such that the location of the head record ...

MAGNETIC DATA ERASER

The magnetic data eraser includes: a mounting and immobilizing tray on which a magnetic recording medium is mounted, the mounting tray being inclined at an angle of 60±10 degrees to the horizontal; a magnetizer that is encircled by a magnetizing coil, the magnetizer having a hollow portion into which the mounting and immobilizing tray is inserted; and a controller that causes an electric current to flow as an excitation current through the magnetizing coil, the excitation current generating a magnetic field that erases data stored in the magnetic recording medium. 1. A magnetic data eraser , comprising:a mounting and immobilizing tray on which a magnetic recording medium is mounted, said mounting tray being inclined at an angle of 60±10 degrees to the horizontal;a magnetizer that is encircled by a magnetizing coil, said magnetizer having a hollow portion into which the mounting and immobilizing tray is inserted; and a controller that causes an electric current to flow as an excitation current through the magnetizing coil, the excitation current generating a magnetic field that erases data stored in the magnetic recording medium.2. The magnetic data eraser according to claim 1 , wherein the mounting and immobilizing tray is a pullout cabinet that is detachable from a body of the magnetic data eraser.3. The magnetic data eraser according to claim 1 , further comprising:a measuring coil is wound around the magnetizing coil and is configured to measure the magnetic flux density of the magnetic field created by the magnetizing coil.4. The magnetic data eraser according to claim 1 , further comprising:a thermometer configured to measure a temperature of the magnetizing coil and generate an alarm when the thermometer detects that the temperature of the magnetizing coil is higher than a predetermined temperature. The present application is a continuation of U.S. patent application Ser. No. 13/549,516, filed Jul. 15, 2012, which is incorporated by reference herein in its ...

COMPENSATING FOR LOSS OF CURRENT THROUGH SHORTED TUNNELING MAGNETORESISTANCE SENSORS

Embodiments of the present invention provide methods, systems, and computer program products for compensating for loss of current through shorted tunneling magnetoresistance (TMR) sensors. In one embodiment, for a magnetic head having multiple TMR read sensors, a first voltage limit is set for most parts and a second voltage limit is set for all of the parts. A number of TMR read sensors which are allowed to function between the first and the second voltage limits is determined using a probability algorithm, which determines the probability that the application of the second voltage limit will result in a dielectric breakdown within an expected lifetime of a drive is below a threshold value. For the number of TMR read sensors which are allowed to function at voltages between the first and second voltage limits, a determined subset of those sensors are then allowed to function at the second voltage limit. 1one or more computer processors;one or more non-transitory computer readable storage media; and program instructions to, for a magnetic head having multiple TMR read sensors, set a first voltage limit for a plurality of parts and a second voltage limit for all of the parts;', 'program instructions to determine a number of TMR read sensors which are allowed to function between the first and the second voltage limits using a probability algorithm, wherein the probability algorithm is configured to determine the probability that one or more defective tracks are selected when a number of tracks are selected and limits the number of tracks selected for the second voltage limit based on a statistical algorithm of selecting one or more defective tracks, and wherein the probability that application of the second voltage limit will result in a dielectric breakdown within an expected lifetime of a drive is below a threshold value;', 'program instructions to, responsive to determining a number of TMR read sensors which are allowed to function at voltages between the first and ...

MAGNETIC RECORDING APPARATUS AND CONTROLLING METHOD OF MAGNETIC RECORDING APPARATUS

In case of deleting shingle-recorded data on a recording medium, it enables to completely delete the data with the number of writing times less than the number of writing times in data recording. To do so, a magnetic recording apparatus, which records the data on the recording medium in a first direction with a writing unit, controls movement of a relative position of the recording medium and the writing unit such that a quantity of the movement in a second direction perpendicular to the first direction in the data deletion by overwriting another data is larger than a quantity of the movement in the second direction in the data recording. 1: A magnetic recording apparatus comprising:a writing unit configured to form a recording column extending in a first direction, by applying a recording magnetic field to a recording medium;a moving unit configured to move a relative position of the recording medium and the writing unit to a second direction perpendicular to the first direction; anda controlling unit configured to control the writing unit and the moving unit such that, on the recording medium, the recording columns mutually adjacent in regard to the second direction partially overlap in the second direction,wherein the controlling unit controls the moving unit such that a quantity of movement in the second direction in a case of deleting information written on the recording medium by overwriting with the writing unit another information on the recording column in which the information has been written is larger than a quantity of movement in the second direction in a case of writing information on the recording medium with the writing unit, andwherein the writing unit, the moving unit, and the controlling unit are implemented by at least one circuit.2: The magnetic recording apparatus according to claim 1 , wherein the controlling unit controls the moving unit such that claim 1 , in the case of writing information with the writing unit claim 1 , the quantity of ...

THERMAL MANAGEMENT OF LASER DIODE MODE HOPPING FOR HEAT ASSISTED MEDIA RECORDING

A method and apparatus provide for determining a temperature at a junction of a laser diode when the laser diode is operated in a lasing state that facilitates heat-assisted magnetic recording, comparing the junction temperature and an injection current supplied during the lasing state to stored combinations of junction temperature and injection current, and determining a likelihood of mode hopping occurring for the laser diode during the lasing state based on the comparison to stored combinations of junction temperature and injection current. 1. An apparatus , comprising: a read element and a write element respectively situated at an air bearing surface (ABS) of the slider;', 'a near-field transducer (NFT) situated at the ABS proximate the write element;', 'an optical waveguide configured to couple light from the laser diode to the NFT;', 'a temperature sensing arrangement configured to calculate a temperature of the laser diode junction based on a voltage differential between a non-steady lasing state of the laser diode and a steady state lasing state of the laser diode; and', 'a heater arrangement disposed on the slider and configured to heat the junction of the laser diode during least a portion of the non-lasing state and at least a portion of the lasing state of the laser diode., 'a slider and a laser diode configured to facilitate heat assisted magnetic recording (HAMR), the slider comprising2. The apparatus of claim 1 , wherein the heater arrangement and the laser diode define independent circuits.3. The apparatus of claim 1 , wherein the heater arrangement and the laser diode are configured to be independently controllable.4. The apparatus of claim 1 , comprising:a heater control coupled to the heater arrangement; anda laser control coupled to the laser diode;wherein the heater control and the laser control define independently controllable circuits.5. The apparatus of claim 1 , wherein the heater arrangement is electrically coupled to the laser diode.6. ...

AUTOMATIC GAIN CONTROL LOOP ADAPTATION FOR ENHANCED NYQUIST DATA PATTERN DETECTION

Techniques are provided for automatic gain control loop adaptation in circuitry for processing such data signals. In one example, an apparatus comprises read channel circuitry and signal processing circuitry associated with the read channel circuitry. The signal processing circuitry comprises an amplifier, a detector operatively coupled to the amplifier, and a feedback path operatively coupled between the detector and the amplifier. The amplifier is configured to receive and amplify an input signal received by the read channel circuitry. The detector is configured to detect a data pattern from the amplified input signal. The feedback path is configured to provide a feedback signal to the amplifier to adjust a gain of the amplifier, and to generate the feedback signal in accordance with a value selected to improve detection of the data pattern by increasing an amplitude of the data pattern around a given frequency. 1. An apparatus , comprising:read channel circuitry; and an amplifier, the amplifier being configured to receive and amplify an input signal received by the read channel circuitry;', 'a detector operatively coupled to the amplifier, the detector being configured to detect a data pattern from the amplified input signal and to generate a detected digital signal representing the data pattern; and', 'a feedback path operatively coupled between the detector and the amplifier, the feedback path being configured to provide a feedback signal to the amplifier to adjust a gain of the amplifier, wherein the feedback path generates the feedback signal in accordance with a value selected to improve detection of the data pattern by increasing an amplitude of the data pattern around a given frequency;, 'signal processing circuitry associated with the read channel circuitry, the signal processing circuitry comprisingwherein the feedback path further comprises a multiplier operatively coupled to the detector and configured to multiply the value with the detected digital ...

MAGNETIC RECORDING DISK DRIVE WITH WRITE DRIVER TO WRITE HEAD TRANSMISSION LINE WITH MULTIPLE SEGMENTS HAVING DIFFERENT NUMBERS OF CONDUCTIVE TRACES

A multiple-segment transmission line in a hard disk drive enables a wider optimization range of the slope, duration and amplitude of the transmission line overshoot (TLO) wave shape. There is a first segment with two traces for connection to the write driver circuitry, an end segment with two traces for connection to the write head and at least two intermediate segments. The number of traces in a segment is different from the number of traces in the segments to which the segment is immediately connected. There is an even number of traces in each segment and the traces in each segment are interleaved. The number of segments and the number of traces in each segment can be selected to achieve the desired impedance levels for the different segments to achieve the desired wave shape for the TLO. All of the traces on the transmission line are preferably coplanar. 1. In a magnetic recording disk drive having write driver circuitry and an inductive write head , a transmission line between the write driver circuitry and the write head comprising:multiple connected transmission line segments, each segment comprising a number of electrically conductive +W traces for positive write signals and an equal number of electrically conductive traces −W traces for negative write signals interleaved with the +W traces, the transmission line including a first segment with two traces for connection to the write driver circuitry, an end segment with two traces for connection to the write head, and at least two intermediate segments, wherein the number of traces in each intermediate segment is greater than two and different from the number of traces in the segments to which it is immediately connected.2. The transmission line of further comprising a substrate and an insulator layer on the substrate claim 1 , wherein the electrically conductive traces are formed on the insulator layer.3. The transmission line of further comprising segment interconnects between the segments claim 2 , each ...

READ HEAD CHARACTERISTIC PRE-DETECTION

Implementations disclosed herein provide a method comprising applying voltage to a read head during an unload state, detecting characteristic read head data, and storing the detected characteristic read head data in a buffer. In another implementation, the method further comprises performing a read retry operation in response to a read failure, reading the detected characteristic read head data from the buffer, determining if the detected characteristic read head data meets a threshold for a first predetermined criterion, performing a correction operation if the threshold for the first the first predetermined criterion is met, determining whether a media sector is read successfully, and ending the read retry operation if the media sector is read successfully. 1. A method comprising:applying voltage to a read head during an unload state; anddetecting characteristic read head data responsive to the applied voltage.2. The method of claim 1 , further comprising:storing the detected characteristic read head data in a buffer.3. The method of claim 2 , further comprising:performing a read retry operation in response to a read failure;reading the detected characteristic read head data from the buffer; anddetermining if the detected characteristic read head data meets a threshold for a first predetermined criterion.4. The method of claim 3 , further comprising:performing a correction operation responsive to meeting the threshold for the first predetermined criterion.5. The method of claim 4 , further comprising:determining whether a media sector is read successfully; andending the read retry operation based on a determination of a successful media sector read.6. The method of claim 3 , further comprising performing another read retry operation responsive to not meeting the first predetermined criterion.7. The method of claim 3 , further comprising performing another read retry operation if the media sector is not read successfully.8. A storage device claim 3 , comprising:a ...

DETERMINING INSTABILITY ZONES OF A LASER OF A HEAT-ASSISTED MAGNETIC RECORDING HEAD

Stability or instability zones are determined for ambient temperatures and one or more operational parameters applied to a heat-assisted magnetic recording head. Operations within the stability or instability zones resulting in respective stable or unstable operation of a laser of the recording head. During operation of the recording head, it is determining that a current ambient temperature and currently applied values of the one or more operational parameters are at or near one of the instability zones, and a write operation of the recording head is modified in response. 1. A method , comprising:determining instability zones for ambient temperatures and one or more operational parameters applied to a heat-assisted magnetic recording head that writes to a recording medium, the one or more operational parameters including one or more of a laser input bias current and a laser input boost current, operations within the instability zones resulting in instability in operation of a laser of the recording head;during operation of the recording head, determining that a current ambient temperature and currently applied values of the one or more operational parameters are at or near one of the instability zones; andmodifying a write operation of the recording head in response thereto.2. (canceled)3. The method of claim 1 , wherein the one or more or more operation inputs include a read clearance heater input that is applied before the write operation.4. The method of claim 1 , wherein modifying the write operation comprises delaying the write operation.5. The method of claim 1 , wherein modifying the write operation comprises changing one or more of a clearance heater current claim 1 , a laser input bias current claim 1 , a laser input boost current claim 1 , and a write coil current.6. The method of claim 1 , wherein modifying the write operation comprises changing a current to a laser heater.7. The method of claim 1 , wherein modifying the write operation comprises using a ...

MAGNETIC RECORDING DEVICE

According to one embodiment, a magnetic recording device includes a magnetic head, a first electrical circuit, and a second electrical circuit. The magnetic head includes a magnetic pole, a first shield, a conductive member electrically connecting the magnetic pole and the first shield and being provided between the magnetic pole and the first shield, and a coil. The first electrical circuit is configured to supply a first current to the magnetic pole, the conductive member, and the first shield. The second electrical circuit is configured to supply a recording current to the coil. A recording magnetic field is generated from the magnetic pole. The recording magnetic field corresponds to the recording current. A rise time of the recording current is not less than 65% of a shortest bit length. 1. (canceled)2. A magnetic recording device according to claim 1 , comprising: a magnetic pole,', 'a first shield,', 'a conductive member electrically connecting the magnetic pole and the first shield and being provided between the magnetic pole and the first shield, and', 'a coil;, 'a magnetic head includinga first electrical circuit configured to supply a first current to the magnetic pole, the conductive member, and the first shield; anda second electrical circuit configured to supply a recording current to the coil,a recording magnetic field being generated from the magnetic pole, the recording magnetic field corresponding to the recording current, anda rise time of the recording current being not less than 65% of a shortest bit length, the conductive member includes:', 'a magnetic layer;', 'a first conductive layer contacting the magnetic pole and the magnetic layer, being provided between the magnetic pole and the magnetic layer, including one of a first material or a second material, and being nonmagnetic; and', 'a second conductive layer contacting the magnetic layer and the first shield, being provided between the magnetic layer and the first shield, including the ...

THERMAL MANAGEMENT OF LASER DIODE MODE HOPPING FOR HEAT ASSISTED MEDIA RECORDING

A method and apparatus provide for determining a temperature at a junction of a laser diode when the laser diode is operated in a lasing state that facilitates heat-assisted magnetic recording, comparing the junction temperature and an injection current supplied during the lasing state to stored combinations of junction temperature and injection current, and determining a likelihood of mode hopping occurring for the laser diode during the lasing state based on the comparison to stored combinations of junction temperature and injection current. 1. An apparatus , comprising:a slider configured to facilitate heat assisted magnetic recording (HAMR);a laser diode disposed in the slider;a read element and a write element respectively situated at an air bearing surface (ABS) of the slider;a near-field transducer (NFT) situated at the ABS proximate the write element;an optical waveguide configured to couple light from the laser diode to the NFT; anda heater arrangement disposed in, along, or adjacent the laser diode and configured to heat a junction of the laser diode during one or both of at least a portion of the non-lasing state and at least a portion of the lasing state of the laser diode.2. The apparatus of claim 1 , wherein the heater arrangement is configured to heat the junction of the laser diode during at least the portion of the non-lasing state and at least the portion of the lasing state of the laser diode.3. The apparatus of claim 1 , wherein the heater arrangement is disposed in the laser diode.4. The apparatus of claim 1 , wherein the slider has a laser-in-slider (LIS) configuration.5. The apparatus of claim 1 , comprising a temperature sensing arrangement configured to determine a temperature of a junction of the laser diode.6. The apparatus of claim 1 , comprising:a temperature sensing arrangement coupled to the laser diode and configured to determine a temperature of a junction of the laser diode;wherein the temperature sensing arrangement is configured ...

STORAGE DEVICE FLASHING OPERATION

An example hard disk drive includes a multiplexer. The multiplexer is coupled to a communication interface, a hard disk drive controller, and a storage device. The multiplexer is to, in response to a detection of a first selection command via a first set of pins of the communication interface, route first firmware data from a second set of pins of the communication interface to the storage device during a first flashing operation. The hard disk drive controller is bypassed during the routing of the first firmware data. The multiplexer is also to, in response to a detection of a second selection command via the first set of pins, route second firmware data from the hard disk drive controller to the storage device during a second flashing operation. The second firmware data is received via the third set of pins. 1. A hard disk drive comprising:a communication interface including a first set of pins, a second set of pins, and a third set of pins;a multiplexer coupled to the communication interface;a hard disk drive controller coupled to the multiplexer; in response to a detection of a first selection command via the first set of pins, route first firmware data from the second set of pins to the storage device during a first flashing operation, wherein the hard disk drive controller is bypassed during the routing of the first firmware data; and', 'in response to a detection of a second selection command via the first set of pins, route second firmware data from the hard disk drive controller to the storage device during a second flashing operation, wherein the second firmware data is received via the third set of pins., 'a storage device coupled to the multiplexer, wherein the multiplexer is to2. The hard disk drive of claim 1 , wherein the detection of the first selection command corresponds to a detection of a first voltage level claim 1 , wherein the detection of the second selection command corresponds to a detection of a second voltage level claim 1 , and wherein ...

SYSTEM AND METHOD FOR PROVIDING CONTROLLABLE STEADY STATE CURRENT WAVESHAPING IN A HARD DISK DRIVE (HDD) PREAMPLIFIER

Aspects of the disclosure pertain to a system and method for providing controllable steady state current waveshaping in a preamplifier of a data storage system (e.g., hard disk drive). The preamplifier provides an output including a write current waveform having a steady state current level that is controllable via the write block circuitry of the preamplifier. This enhances the ability of the waveform to promote improved on-track and off-track write performance. 1. A data storage system , comprising:a preamplifier, the preamplifier including write block circuitry, the write block circuitry including a steady state current level block, a first current overshoot block and a second current overshoot block, wherein the steady state current level block, the first current overshoot block and the second current overshoot block are configured for generating a plurality of signal outputs, the preamplifier configured for generating and transmitting an output derived from the plurality of signal outputs;write coils, the write coils being operationally coupled with the preamplifier;a write head, the write head being magnetically coupled with the write coils, the write coils configured for controlling magnetization of the write head, the write head being operationally coupled with the preamplifier, the write coils and write head configured for receiving the transmitted output from the preamplifier; anda recording medium, the recording medium being operationally coupled with the write head,wherein the write head is configured for writing data to the recording medium based upon the received preamplifier output, the preamplifier output including a write current waveform having a steady state current level that is controllable via the second current overshoot block.2. The data storage system as claimed in claim 1 , wherein the data storage system is a hard disk drive.3. The data storage system as claimed in claim 1 , wherein the write block circuitry includes a signal summer claim ...

MAGNETIC DISK MANAGEMENT METHOD, APPARATUS AND ELECTRONIC DEVICE

The present application discloses a magnetic disk management method, an apparatus and an electronic device by providing an engine layer including a plurality of space files and an encapsulation layer including a file directory tree of a space file structure; where the engine layer responds to a data management operation performed for a target space file of the file directory tree output by the engine layer, and a target magnetic disk space corresponding to the target space files is determined through the address association list of the encapsulation layer, and data management is performed on the data in the target magnetic disk space. Thereby, different data can be isolated by different space files when entering through the engine layer, which ensures that security issues such as leakage of the data in the magnetic disk will not occur. 1. A magnetic disk management method , wherein the magnetic disk management method is applicable to a distributed storage architecture based on a shingled magnetic disk , the distributed storage architecture of the shingled magnetic disk comprises: an engine layer , an encapsulation layer and a magnetic disk layer;wherein the engine layer stores a plurality of space files, and each space file is relatively independent; the encapsulation layer stores a file directory tree for representing a space file structure; and the magnetic disk layer comprises a plurality of magnetic disk spaces;the magnetic disk management method comprises:responding to a data management operation performed for a target space file of the file directory tree output by the engine layer, and determining a file address of the target space file through space file index items in the engine layer;transparently transmitting, through the engine layer, the data management operation and the file address of the target space file to the encapsulation layer;determining a space address of a target magnetic disk space corresponding to the file address of the target space file ...

MAGNETIC DISK DEVICE AND METHOD

According to one embodiment, a magnetic disk device includes a first actuator system, a second actuator system, a first controller, and a second controller. A first magnetic head is provided at a tip of the first actuator system. A second magnetic head is provided at a tip of the second actuator system. The first controller controls the first actuator system and relatively moves the first magnetic head with respect to the magnetic disk. The second controller controls the second actuator system and relatively moves the second magnetic head with respect to the magnetic disk. While the first magnetic head is retracted, the second controller acquires first information corresponding to input to the first actuator system and uses the first information to perform positioning control of the second magnetic head. 1. A magnetic disk device comprising:a magnetic disk;a first magnetic head and a second magnetic head that record data and reproduce data with respect to the magnetic disk;a first actuator system provided with the first magnetic head;a second actuator system provided with the second magnetic head;a first controller that controls the first actuator system and moves the first magnetic head relative to the magnetic disk; anda second controller that controls the second actuator system and moves the second magnetic head relative to the magnetic disk,wherein, while the first magnetic head is retracted, the second controller acquires first information corresponding to input to the first actuator system and uses the first information to control a position of the second magnetic head.2. The magnetic disk device of claim 1 , wherein the second controller uses the first information as feed forward input to control the position of the second magnetic head.3. The magnetic disk device of claim 1 , a first servo controller that drives the first actuator system, and', 'a first processor that inputs second information based at least in part on a position signal read by the first ...

MAGNETIC DISK DEVICE AND WRITE PROCESSING METHOD

According to one embodiment, a magnetic disk device includes a disk having a first area, and a second area to which data is temporary written, a head including a write head which writes data to the disk, and an assisting element which generates energy which improves write performance of the write head, and a controller which writes data to the first area by supplying energy having a first value to the assisting element, and writes data to the second area by supplying energy having a second value different from the first value to the assisting element. 1. A magnetic disk device comprising:a disk having a first area, and a second area to which data is temporary written;a head including a write head which writes data to the disk, and an assisting element which generates energy which improves write performance of the write head; anda controller which writes data to the first area by supplying energy having a first value to the assisting element, and writes data to the second area by supplying energy having a second value different from the first value to the assisting element.2. The magnetic disk device of claim 1 , wherein when the controller determines to write data to the second area claim 1 , the controller temporary writes first data to the second area claim 1 , and reads the first data from the second area and writes the first data to the first area.3. The magnetic disk device of claim 2 , wherein when the controller determines not to write data to the second area claim 2 , the controller writes the first data to the first area.4. The magnetic disk device of claim 1 , wherein the second value is less than the first value.5. The magnetic disk device of claim 1 , wherein the assisting element is a spin torque oscillator which generates a high-frequency magnetic field on the disk.6. The magnetic disk device of claim 5 , wherein the first value and the second value are currents or voltages.7. The magnetic disk device of claim 5 , wherein the second value is 0.8. The ...

STORAGE DEVICE, COMPUTER-READABLE NONVOLATILE STORAGE MEDIUM TO STORE CONTROL PROGRAM OF STORAGE DEVICE, AND CONTROL METHOD OF STORAGE DEVICE

In an embodiment, a storage device includes a shingled magnetic recording device, a management unit, selection unit, and execution unit. The shingled magnetic recording device performs writing in unit of a band including tracks being adjacent to and partially overlapping with each other. The management unit manages management information mutually associating band identifier of the band, characteristic information indicating a possibility that data stored in the band is not referred to, and data identifier of the data in a case where the data is stored in the band. The selection unit selects the band of the shingled magnetic recording device storing the data based on the data and the characteristic information in a case where the shingled magnetic recording device is requested to store the data. The execution unit stores the data to the selected band. 1. A storage device comprising:a shingled magnetic recording device that performs writing in unit of a band including tracks being adjacent to and partially overlapping with each other;a management unit that manages management information mutually associating band identification information of the band, characteristic information indicating a possibility that data stored in the band is not referred to, and data identification information of the data in a case where the data is stored in the band;a selection unit that selects the band of the shingled magnetic recording device storing the data based on the data and the characteristic information in a case where the shingled magnetic recording device is requested to store the data; andan execution unit that stores the data to the selected band.2. The storage device according to claim 1 ,wherein the selection unit selects the band in a case where an effective period of the data is shorter than a data effective period indicating the characteristic information,the storage device further comprising:a delete unit that deletes the data in a case where the effective period of the ...

Data storage device reverse biasing head element to counter electro-migration

A data storage device is disclosed comprising a first head actuated over a first disk surface, the first head comprising a plurality of elements including a first element. During a first write operation of the first head, a first bias signal having a first polarity is applied to the first element, and a write interval of the first write operation is measured. During a non-write mode of the first head, a second bias signal having a second polarity opposite the first polarity is applied to the first element during a reverse bias interval that is based on the write interval of the first write operation.

Erasing recorded data by utilizing read head and write head

Techniques for reducing the time required for erasing specific data recorded on a tape medium. A specific group of records is erased without preliminarily locating the erasure end position. This is carried out by simultaneously utilizing three heads, that is, two read heads and one write head, to detect the erasure end position during data erasure. Various embodiments are applicable to tape media as well as other storage media. Various embodiments are not only applicable as a file system cooperating as a combination of hardware (H/W) and software (S/W), but also applicable in systems, such as databases, that directly use storage without an intermediary file system.

MAGNETIC HEAD AND MAGNETIC RECORDING DEVICE

According to one embodiment, a magnetic head includes a recording portion. The recording portion includes a magnetic pole, a shield, and a stacked body provided between the magnetic pole and the shield. The stacked body includes a first magnetic layer, a first layer provided between the first magnetic layer and the magnetic pole, and a first intermediate layer provided between the first magnetic layer and the shield. The first layer contacts the magnetic pole and includes at least one selected from the group consisting of IrMn, PtMn, FeMn, PdMn, NiMn, RhMn, MnCr, and PtCr. The first intermediate layer includes at least one selected from a first group consisting of Cu, Ag, Au, Al, Cr, and Ru. 1. A magnetic head , comprising: a magnetic pole,', 'a shield, and', 'a stacked body provided between the magnetic pole and the shield,, 'a recording portion including'} a first magnetic layer,', 'a first layer provided between the first magnetic layer and the magnetic pole, the first layer contacting the magnetic pole and including at least one selected from the group consisting of IrMn, PtMn, FeMn, PdMn, NiMn, RhMn, MnCr, and PtCr, and', 'a first intermediate layer provided between the first magnetic layer and the shield, the first intermediate layer including at least one selected from a first group consisting of Cu, Ag, Au, Al, Cr, and Ru., 'the stacked body including'}2. The head according to claim 1 , whereina current having an orientation from the shield toward the magnetic pole flows in the stacked body.3. A magnetic head claim 1 , comprising: a magnetic pole,', 'a shield, and', 'a stacked body provided between the magnetic pole and the shield, the stacked body including', 'a first magnetic layer,', 'a first layer provided between the first magnetic layer and the shield, the first layer contacting the shield and including at least one selected from the group consisting of IrMn, PtMn, FeMn, PdMn, NiMn, RhMn, MnCr, and PtCr, and', 'a first intermediate layer provided ...

INDICATING TRACKS AS ERASED WITHOUT DELETING DATA FOR THE TRACKS

Provided are a computer program product, system, and method for indicating tracks as erased without deleting data for the tracks. In response to receiving erase commands to erase tracks in the storage, indicating the tracks as erased without performing an erase operation on the tracks subject to the erase command. Data in the storage for the tracks indicated as erased remains in the storage while requests are directed to the tracks indicated as erased. A command is received indicating an operation with respect to a target track. The operation to proceed is permitted with respect to the target track in response to determining that the target track is not indicated as erased. An alternate operation is performed providing a result different from the operation indicated in the command in response to determining that the target track is indicated as erased. 121-. (canceled)22. A computer program product for performing an erase of tracks in a storage , the computer program product comprises a computer readable storage medium having program instructions embodied therewith , the program instructions executable by a processor to cause operations , the operations comprising:in response to receiving erase commands to erase tracks in the storage, indicating the tracks as erased without performing an erase operation on the tracks subject to the erase command, wherein data in the storage for the tracks indicated as erased remains in the storage while requests are directed to the tracks indicated as erased; andin response to receiving read and write requests to target tracks in the storage, determining whether the target tracks are indicated as erased to prevent access to data in the target tracks indicated as erased.23. The computer program product of claim 22 , wherein the operations further comprise:permitting the received read and write requests to the target tracks to proceed in response to determining that the target tracks are not indicated as erased; andperforming an ...

BAND REWRITE OPTIMIZATION

Implementations disclosed herein provide a method comprising comparing high-latency data sectors of a storage band, the high-latency data sectors having latency above a predetermined threshold, with target sectors for storing new data to determine one or more of the high-latency data sectors that may be skipped during retrieval of at-rest data from the storage band. 1. A method comprising:comparing high-latency data sectors of a storage band with target sectors to determine one or more of the high-latency data sectors that may be skipped during retrieval of at-rest data from the storage band.2. The method of claim 1 , wherein comparing high-latency data sectors of a storage band is activated in response to a band update request.3. The method of claim 1 , wherein the high-latency data sectors of the storage band are known sectors skipped during read operations.4. The method of claim 1 , wherein comparing high-latency data sectors occurs in a shingled magnetic recording device.5. The method of claim 1 , wherein the target sectors are for storing new data.6. The method of claim 1 , further comprising:selecting a band for data update; anddetermining if a read-modify-write operation is required.7. The method of claim 6 , further comprising:determining if a skip mask operation hardware cannot support a full band update map;setting up a skip mask operation; andperforming a band rewrite optimization process using the skip mask operation.8. The method of claim 1 , further comprising setting up a skip mask operation to skip one or more high-latency data sectors.9. The method of claim 8 , further comprising performing a band rewrite operation using the skip mask operation.10. The method of claim 1 , wherein comparing high-latency data sectors of a storage band is activated in response to a write request to transfer data.11. The method of claim 10 , further comprising determining whether a skip mask operation can support a full band update map.12. The method of claim 11 , ...

PREAMPLIFIER FOR ADJUSTABLE WRITE CURRENT

The implementations disclosed herein provide for a storage device including a preamplifier that dynamically adjusts at least one of a rise time and fall time of an analog write current pulse based on a length of a corresponding write transition and/or characteristics of a media location where the write transition is to be recorded. 1. An apparatus comprising:a preamplifier configured to adjust at least one of a rise time and a fall time of an analog write current pulse based on a length of a corresponding write transition, the preamplifier comprising a finite impulse response (FIR) filter that alters a waveform of the analog write current pulse input into the FIR filter.2. The apparatus of claim 1 , wherein a write pulse associated with a single-bit write transition is adjusted to have a faster rise time than another write pulse associated with a multi-bit write transition.3. The apparatus of claim 1 , wherein the preamplifier increases at least one of a steady state current and an overshoot current based on the length of the write transition.4. (canceled)5. The apparatus of claim 1 , wherein the FIR filter is configured to boost a peak current of the analog write current pulse based on frequency of the analog write current pulse.6. The apparatus of claim 5 , wherein a higher frequency analog write current pulse is boosted more than a lower frequency analog write current pulse.7. The apparatus in claim 1 , wherein the preamplifier is configured to adjust the rise time if rising and falling edges of a bit stream are detected within a timing delta stored in a programmable register.8. The apparatus of claim 1 , wherein the preamplifier is configured to adjust the rise time based on an external control signal from a write channel.9. The apparatus of claim 8 , wherein the external control signal is a voltage that modulates based on frequency of a corresponding transition.10. A storage device comprising:a preamplifier configured to adjust a write current setting including ...

Tape media kiss-contact read verification

Determining quality metrics of a magnetic tape recording medium. A production module that includes a write element that writes magnetic transitions to the magnetic tape is substantially in constant physical engagement with the magnetic tape. A supplemental module that includes one or more read elements periodically physically engages the magnetic tape, and the read elements generate an electrical signal corresponding to transitions written to the magnetic recording medium by a write element. A computer receives information representative of the electrical signal and determines if a quality metric of the magnetic recording medium derived from the electrical signal is within a defined range. If the quality metric is not within the defined range, a defined action is performed by the computer.

TAPE DAMAGE DETECTION

In one general embodiment, a method includes calculating a differential position value based on readback signals from at least two servo readers of a magnetic head reading servo tracks of a magnetic recording tape. The differential position value is compared to a previously-calculated differential position value. An action is performed in response to determining that the difference between the differential position value and the previously-calculated differential position value is in a predefined range. In another general embodiment, an apparatus includes a magnetic head having at least two servo readers, and a controller in communication with the servo readers. The controller is configured to detect a sudden change in a width of a magnetic recording tape based on a differential position value derived from relatively more current servo readback data and a second differential position value derived from relatively older servo readback data. 1. A method , comprising:calculating a differential position value based on readback signals from at least two servo readers of a magnetic head reading servo tracks of a magnetic recording tape;comparing the differential position value to a previously-calculated differential position value; andperforming an action in response to determining that the difference between the differential position value and the previously-calculated differential position value is in a predefined range.2. A method as recited in claim 1 , wherein the difference being in the predefined range is indicative of a stretching of only a portion of the magnetic recording tape.3. A method as recited in claim 1 , wherein the difference being in the predefined range is indicative of an expansion of only a portion of the magnetic recording tape.4. A method as recited in claim 1 , wherein the differential position value is an average of differential position values for a set of samples claim 1 , wherein the previously-calculated differential position value is an ...

MAGNETIZATION CONTROL ELEMENT, MAGNETIC MEMORY, AND MAGNETIC RECORDING SYSTEM

A magnetization control element according to an aspect of the invention includes a magnetization control layer containing a magnetoelectric material exhibiting a magnetoelectric effect, and a magnetic coupling layer that is magnetically coupled to a magnetization of a first surface of the magnetization control layer through exchange coupling and exhibits a magnetic state according to the magnetization of the first surface, wherein a magnetization having a component in a direction opposite to a direction of a magnetization of the magnetic coupling layer is imparted to the magnetization control layer. 1. A magnetization control element comprising:a magnetization control layer containing a magnetoelectric material exhibiting a magnetoelectric effect; anda magnetic coupling layer that is magnetically coupled to a magnetization of a first surface of the magnetization control layer through exchange coupling and exhibits a magnetic state according to the magnetization of the first surface,wherein a magnetization having a component in a direction opposite to a direction of a magnetization of the magnetic coupling layer is imparted to the magnetization control layer, and the magnetization control layer has, as a whole, a magnetization in the imparted magnetization direction.2. The magnetization control element according to claim 1 , wherein the magnetization control layer includes: a ferrimagnet; or an antiferromagnet in which at least one constituent element is substituted.3. The magnetization control element according to claim 1 , wherein a magnitude of magnetic energy that the magnetization imparted to the magnetization control layer generates upon writing is smaller than a magnitude of anisotropy energy of the magnetization control layer.4. The magnetization control element according to claim 1 , wherein the exchange coupling between the magnetization control layer and the magnetic coupling layer is antiferromagnetic coupling claim 1 , andthe magnetization direction ...

MAGNETIC STORAGE MEDIA AND DATA STORAGE DEVICE

A magnetic storage media which has an endurance (durability) characteristics close to an infinite number of writing times of data and a data retention (holding) characteristics close to permanency, and is ultra-high-speed writable and erasable, and a data storage device and an image storage device which apply this magnetic storage media are provided. A magnetic storage media includes a thin layer magnet and a magnetic field generating unit arranged facing a surface of the magnet, and is capable of creating or eliminating a skyrmion by applying heat energy to another surface of the magnet positioned on the opposite side of the surface of the magnet, and a skyrmion memory includes the magnetic storage media. 1. A magnetic storage media , comprising:a thin layer magnet; anda magnetic field generating unit arranged facing a surface of the magnet, whereina skyrmion can be created or eliminated by applying heat energy to another surface of the magnet positioned, the other surface on an opposite side of the surface of the magnet.2. The magnetic storage media according to claim 1 , whereinwith respect to a diameter λ of a skyrmion created in the thin layer magnet,{'sub': 'm', 'a plane size of the thin layer magnet has a size of W>λ/2 and'}{'sub': m', 'm', 'm, 'h>λ/2, where Windicates a width of the plane and hindicates a height of the plane.'}3. The magnetic storage media according to claim 2 , whereinthe magnetic field generating unit generates a magnetic field corresponding to a skyrmion crystal phase of the magnet, the magnetic field setting the magnet in a metastable ferromagnetic state, and is capable of creating and eliminating the skyrmion by applying heat energy to another surface of the magnet.4. The magnetic storage media according to claim 3 , wherein in a case where the skyrmion is created in the magnet by locally applying the heat energy to the other surface of the magnet being in a metastable ferromagnetic state claim 3 ,if a Gilbert damping constant α is 0.05 ...

Systems and Methods for Missed Media Sector Alignment

Systems and methods relating generally to data processing, and more particularly to adjusting gain parameters in relation to data processing.

Circuits and methods for cancelling a reflected wave

Method and circuits for cancelling reflected waves from a load are disclosed. An embodiment of the method includes transmitting a signal to the bad from a current source, wherein a transistor is connected in parallel with the current source at a node. The transistor is biased so that a reflected wave at the node will cause the drain to source voltage of the transistor to increase. The drain current of the first transistor increases by way of channel length modulation when the drain to source voltage increases, the increased drain current cancels the reflected wave.

Information recording apparatus, method of controlling the same, and non-transitory computer readable storage medium

An information recording apparatus for recording data in a magnetic recording medium by a shingled write method, the apparatus comprises: a setting unit which sets, when the data is recorded in the magnetic recording medium, whether the data is data of a predetermined type; and a management unit which, if the data is the data of the predetermined type, records the data in an unused area out of a plurality of areas that comprise in the magnetic recording medium, and manages that the data of the predetermined type is recorded in that area, wherein the management unit, if the data of the predetermined type is deleted from the magnetic recording medium, deletes the data of the predetermined type, and manages the area to which the data of the predetermined type was recorded as an unused area.

Laser System for Destroying Data Storage Portion of Hard Drives

Three systems for the destruction of the data storage portion of electronic media storage devices such as hard disk drives, solid state drives and hybrid hard drives. One system utilizes a mill cutter with which the hard drive has relative motion in the direction of the axis of the mill cutter to destroy the data storage portion. A second system utilizes a laser to physically destroy the data storage portion. The third system utilizes a chemical solvent to chemically destroy the data storage portion. 1. A system for physically destroying the data storage portion of an electronic media storage device such as a hard disk drive , a solid state drive and a hybrid hard drive comprising:a chamber;a laser in said chamber for destroying the data storage portion;a cradle for holding an electronic media storage device in said chamber, said cradle or said laser or both being movable to position the laser relative to the electronic media electronic storage device so that the laser destroys the data storage portion of the electronic media storage device while leaving at least a substantial portion of the electronic media storage device intact.2. The system of further including a computer for housing information concerning the type of electronic media storage device and information for controlling the movement of the laser or cradle or both.3. The system of wherein said laser utilizes a micro-drilling process that produces short and ultra-short pulses.4. The system of wherein said laser uses infrared claim 1 , visible or ultra-violet laser applications.5. The system of wherein said laser cuts close patterned micro holes in the data storage portion of the electronic media electronic storage device.6. The system of wherein when said electronic media electronic storage device is a hard disk drive claim 1 , the laser cuts holes in a grid like pattern that resembles a donut.7. The system of wherein when said electronic media electronic storage device is a hybrid hard drive claim 1 , ...

HIGH-BANDWIDTH STO BIAS ARCHITECTURE WITH INTEGRATED SLIDER VOLTAGE POTENTIAL CONTROL

Disclosed herein are circuits, architectures, and methods that provide for the control of a data storage device write head's trailing shield and main pole potential with respect to the disk using circuitry that is integrated with circuitry used to bias a spin torque oscillator (STO) apparatus. Various embodiments include slider connections with STO bias circuitry that resides in a read/write integrated circuit, which has a programmable circuit that generates a bias current with overshoot (bias kicks). Also disclosed are circuits that may be incorporated into a slider to mitigate radio-frequency interference. 1. An apparatus for electrically biasing a spin-torque oscillator (STO) , the apparatus comprising:means for determining an amplitude of a high-frequency component of a bias current;means for determining an amplitude of a low-frequency component of the bias current;means for generating the high-frequency component based at least in part on the determined amplitude of the high-frequency component;means for generating the low-frequency component based at least in part on the determined amplitude of the low-frequency component;means for providing the high-frequency component to the STO; andmeans for providing the low-frequency component to the STO.2. The apparatus recited in claim 1 , further comprising:means for programming a delay or an advance of the high-frequency component before providing the high-frequency component to the STO.3. The apparatus recited in claim 1 , further comprising:means for jointly optimizing (a) a write current for writing to a magnetic medium and (b) at least one of the low-frequency component or the high-frequency component.4. The apparatus recited in claim 1 , wherein generating the high-frequency component is further based at least in part on a signal trigger claim 1 , wherein the signal trigger is determined based on at least one write signal transition.5. The apparatus recited in claim 1 , wherein the means for determining the ...

MAGNETIC DISK DRIVE AND HEAD ADJUSTING METHOD

A magnetic disk drive includes first and second disks having respective first and second surfaces, a first head including a first write head that writes data on the first surface at a first recording density, and a first assist element that generates a first energy for increasing a write performance by the first write head, a second head including a second write head that writes data on the second surface at a second recording density, and a second assist element that generates a second energy for increasing a write performance by the second write head, and a controller that changes one of the first and second recording densities based on a first recording capacity up to which the first head is capable of writing on the first disk, a second recording capacity up to which the second head is capable of writing on the second disk, and a target capacity. 1. A magnetic disk drive , comprising:a first disk having a first surface;a second disk having a second surface;a first head including a first write head configured to write data on the first surface at a first recording density and a first assist element configured to generate a first energy for increasing a write performance by the first write head toward the first surface;a second head including a second write head configured to write data on the second surface at a second recording density and a second assist element configured to generate a second energy for increasing a write performance by the second write head toward the second surface; anda controller configured to change at least one of the first recording density and the second recording density based on a first recording capacity up to which the first head is capable of writing on the first disk, a second recording capacity up to which the second head is capable of writing on the second disk, and a target capacity.2. The magnetic disk drive according to claim 1 , wherein the controller changes at least one of a third energy to be supplied to the first assist ...

Hard Drive Non-Destructive Dismantling System

A system and method for dismantling components of electronic media electronic storage devices such as hard disk drives, solid state drives and hybrid hard drives. The components are dismantled in a nondestructive manner so as to be capable of reuse. First devices loosen the various components of the storage device, Second devices are provided for removing components from the storage device. A holding chassis receives the storage device, and moves the storage device for engagement with the first and second devices. A mechanism may be provided for destroying the data containing portion of the electric storage device when it is removed from the storage device. A database of information concerning past and current storage devices including their configurations, component locations and screw/fastener locations is provided along with a scanning system for retrieving information about the storage device being introduced into the system. The scanned information and information from the database is used to control and position the first and second devices and holding chassis. 1. A system for the non-destructive dismantling of components of electronic media storage devices such as hard disk drives , solid state drives and hybrid hard drives comprising:first devices to loosen various components of the storage device without destroying the components;second devices for dismantling the loosened components from the storage device without destroying the components;a database of information concerning past and current hard drives including their configurations, component locations and screw/fastener locations,a scanning system for retrieving information about the storage device being introduced into the system; anda holding chassis for receiving said storage device and moving the storage device in a position for engagement with said first and second devices, the scanned information and information from the database being used to control and position the first and second devices and ...

CONTROL CIRCUIT

A control circuit to achieve irretrievable erasure of data in a mobile phone comprises a control unit, a SIM unit and a memory unit. The SIM unit is coupled with the control unit and the memory unit. The control unit can provides a delete signal to totally delete data of the memory by the SIM unit. 1. A control circuit for irretrievable deleting data in a mobile phone , the control circuit comprising:a control unit, a SIM unit and a memory unit;wherein the SIM unit is respectively coupled with the control unit and the memory unit, the control unit can provide a delete signal to delete data of the memory unit by the SIM unit.2. The control circuit of claim 1 , wherein the control unit has a first connecting pin and a second connecting pin claim 1 , the SIM unit has a first reset pin and a first power pin claim 1 , the first connecting pin is coupled with the first power pin claim 1 , the second connecting pin is coupled with the first reset pin.3. The control circuit of claim 2 , wherein the memory unit has a plurality of second power pins and a second reset pin claim 2 , the plurality of the second power pins are coupled with the first power pin claim 2 , the second reset pin is coupled with the first reset pin.4. The control circuit of claim 3 , wherein the control unit controls the SIM unit to provide a working voltage for the memory unit by the first power pin coupled with the plurality of second power pins.5. The control circuit of claim 3 , wherein the control unit is configured to provide the delete signal to the first reset pin of the SIM unit claim 3 , the first reset pin of the SIM unit controls the second reset pin to delete irrevocably data of the memory unit.6. The control circuit of claim 3 , wherein the control unit further comprises a third connecting pin claim 3 , the SIM unit comprises a grounding pin claim 3 , the third connecting pin is coupled with the grounding pin.7. The control circuit of claim 1 , wherein the delete signal is a voltage signal ...

MAGNETIC TAPE DEVICE AND MAGNETIC REPRODUCTING METHOD

The magnetic tape device includes a magnetic tape; and a reproducing head, in which the reproducing head is a TMR head, a center line average surface roughness Ra measured regarding a surface of the magnetic layer of the magnetic tape is equal to or smaller than 2.0 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and a ratio (Sdc/Sac) of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30. 1. A magnetic tape device comprising:a magnetic tape; anda reproducing head,wherein the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element,the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm,a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, anda ratio Sdc/Sac of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.2. The magnetic tape device according to claim 1 ,wherein the logarithmic decrement is 0.010 to 0.050.3. The magnetic tape device according to claim 1 ,wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 2.0 nm.4. The magnetic tape device according to claim 2 ,wherein the center line average surface roughness Ra ...

Magnetic tape device and magnetic reproducing method

The magnetic tape device includes a TMR head as a reproducing head; and a magnetic tape which includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder and a binding agent on the non-magnetic support, an XRD intensity ratio (Int(110)/Int(114)) of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.

INTERLACED MAGNETIC RECORDING BAND ISOLATION

Methods and apparatus for allocating logical sectors and bands to store data on interlaced magnetic recording tracks. The systems and methods include formatting a data storage medium to include a plurality of bands, each band of the plurality of bands including a plurality of tracks, the plurality of tracks including a subset of top tracks interlaced with a subset of bottom tracks, and each track of the plurality of tracks including a number of sectors, formatting a first band of the plurality of bands, determining an isolation region of the first band, and formatting a second band of the plurality of bands responsive to determining the isolation region of the first band. 1. A data storage formatting method comprising:filling, with supposed data, a subset of bottom tracks comprising sectors interlaced with a subset of top tracks comprising sectors;iteratively moving supposed data from a sector of the subset of bottom tracks to a sector of the subset of top tracks until a number of empty top tracks inward from an end non-empty bottom track is zero; andassigning an isolation region responsive to a determination that the subset of bottom tracks has a non-full track, assigning that portion of the non-full track as a first portion of the isolation region, and assigning a corresponding portion of an adjacent top track as a second portion of the isolation region, or,responsive to a determination that the subset of bottom tracks does not have a non-full track, assigning no more than an entire adjacent top track as the isolation region.2. The method of claim 1 , wherein prior to filling the subset of bottom tracks claim 1 , determining defective sectors of the subset of bottom tracks claim 1 , and filling the sectors of the subset of bottom tracks avoiding the defective sectors.3. The method of claim 1 , wherein prior to iteratively moving supposed data claim 1 , determining defective sectors of the subset of top tracks claim 1 , and filling the sectors of the subset of top ...

Hard Drive Dismantling System

A system and method reclaims select components containing rare earth metals of electronic media electronic storage devices such as hard disk drives, solid state drives and hybrid hard drives and destroys the data containing components thereof. The system employs first devices, such as milling tools, to loosen various components of the storage device. The various loosened components include the components containing the rare earth metals and the data containing portions. Second devices, such as pick and place mechanisms, are provided for removing components from the storage device. A holding chassis receives the storage device, and moves the storage device for engagement with the first and the second devices. A section is provided for destroying the data containing portion of the electronic media storage device. 1. A system for reclaiming select components containing rare earth materials of an electronic media storage device having a data containing portion and selected from a group consisting of a hard disk drive , a solid state drive and a hybrid hard drive , and destroying the data containing portion thereof , comprising:first devices that loosen various components of the storage device, said components including the components containing the rare earth materials and the data containing portion;second devices that remove components from the storage device;a holding chassis which receives said storage device and moves the storage device for engagement with said first and second devices; anda data destruction section which destroys the data containing portion when it is removed from the storage device.2. The system of wherein said first devices include a milling tool.3. The system of wherein said milling tool bores out a screw from the electronic media storage device.4. The system of wherein said second devices include a pick and place mechanism.5. The system of wherein said second devices include a milling tool that bores out a screw holding a voice coil magnet of ...

SMR-HDD MEDIA CACHE COPY TRANSFER

A shingled magnetic recording (SMR) hard disk drive (HDD) receives a read command for data associated with a range of logical block addresses (LBAs). In situations where a first portion of valid data associated with the range of LBAs is stored in an SMR region of the HDD and a second portion of valid data associated with the range of LBAs is stored in a non-SMR region of the HDD, the first portion is read from the SMR region in a single disk access and copied to a first buffer of the HDD, and the second portion is read from the non-SMR region in one or more disk accesses and copied to a second buffer of the HDD. The valid data associated with the range of LBAs stored in the second buffer are copied to the first buffer to be combined with valid data associated with the range of LBAs stored in the first buffer, and the combined valid data is then transferred to the host to complete execution of the read command. 1. A method of reading data from a magnetic storage device in response to a read command from a host , the method comprising:reading data from a shingled magnetic recording (SMR) region of the magnetic storage device into a first buffer;reading data from a non-SMR region of the magnetic storage device into a second buffer; andtransmitting the contents of the first buffer and the second buffer to the host.2. The method of claim 1 , wherein transmitting the contents of the first buffer and the second buffer to the host comprises:copying data in the second buffer into the first buffer; andtransmitting the contents of the first buffer to the host.3. The method of claim 1 , wherein the read command specifies a range of logical block addresses (LBAs) claim 1 , and valid data associated with the range of LBAs are stored in both the SMR region and the non-SMR region.4. The method of claim 3 , wherein the data read into the first buffer includes valid data and invalid data associated with the range of LBAs claim 3 , and the invalid data in the first buffer are ...

TECHNIQUES FOR CLEARLY DISTINGUISHING BETWEEN NEIGHBORING SPIRALS IN AN SSW SCHEME

During in-drive writing of a servo spiral on a disk surface, a servo spiral can be distinguished during demodulation from adjacent servo spirals on the same disk surface. When a set of servo spirals is written on a disk surface, a first spiral is written to include a first identifying characteristic and the following spiral is written to include a second identifying characteristic. The identifying characteristic may include embedded sync marks encoding a certain numerical value, a unique frequency of high-low transitions included in each spiral, and/or a unique frame size. 1. A data storage device comprising:a rotatable disk with a writable surface;a read head configured to generate a first signal as the read head crosses a first servo spiral written on the writable surface and a second signal as the read head crosses a second servo spiral written on the writable surface, wherein the first and second servo spirals are each written continuously on the writable surface and start from a first radial location of the writable surface and end at a second radial location of the writable surface; 'and', 'a read channel configured to detect signals of a predetermined frequency range;'}a controller configured to distinguish between the first servo spiral and the second servo spiral when the detected signals of the predetermined frequency range include the first and second signals, based on identifying characteristics of the first and second signals.2. The data storage device of claim 1 , wherein the identifying characteristic of the first signal includes a first numeric value encoded in a sync mark of the first signal and the identifying characteristic of the second signal includes a second numeric value encoded in a sync mark of the second signal.3. The data storage device of claim 1 , wherein the identifying characteristic of the first signal includes high-low transitions of a first frequency and the identifying characteristic of the second signal includes high-low ...

SHINGLED MAGNETIC RECORDING HARD DISK DRIVE MEDIA CACHE COPY TRANSFER

A shingled magnetic recording (SMR) hard disk drive (HDD) receives a read command for data associated with a range of logical block addresses (LBAs). In situations where a first portion of valid data associated with the range of LBAs is stored in an SMR region of the HDD and a second portion of valid data associated with the range of LBAs is stored in a non-SMR region of the HDD, the first portion is read from the SMR region in a single disk access and copied to a first buffer of the HDD, and the second portion is read from the non-SMR region in one or more disk accesses and copied to a second buffer of the HDD. The valid data associated with the range of LBAs stored in the second buffer are copied to the first buffer to be combined with valid data associated with the range of LBAs stored in the first buffer, and the combined valid data is then transferred to the host to complete execution of the read command. 1. (canceled)2. A method of reading data from a magnetic storage medium in response to a read command from a host , the method comprising:reading first data from a shingled magnetic recording (SMR) region of the magnetic storage medium into a first buffer of a memory device different from the magnetic storage device, the first data including one or more fragments of valid user data and one or more fragments of invalid user data;reading second data from a non-SMR region of the magnetic storage medium into a second buffer of the memory device, the second data including one or more fragments of updated user data; andtransmitting to the host the one or more fragments of valid user data from the first buffer and the one or more fragments of updated user data from the second buffer.3. The method of claim 2 , wherein the read command specifies a range of logical block addresses (LBAs) claim 2 , and the one or more fragments of valid user data stored in the SMR region and the one or more fragments of updated user data stored in the non-SMR region are associated with ...

Thermal management of laser diode mode hopping for heat assisted media recording

A method and apparatus provide for determining a temperature at a junction of a laser diode when the laser diode is operated in a lasing state that facilitates heat-assisted magnetic recording, comparing the junction temperature and an injection current supplied during the lasing state to stored combinations of junction temperature and injection current, and determining a likelihood of mode hopping occurring for the laser diode during the lasing state based on the comparison to stored combinations of junction temperature and injection current.

SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE, MAGNETIC DISK STORAGE DEVICE, AND ELECTRONIC APPARATUS

A semiconductor integrated circuit device has a p-type substrate to which a ground voltage is applied and a floating-type NMOSFET which is integrated on the p-type substrate and to which a negative voltage lower than the ground voltage is applied. The floating-type NMOSFET includes an n-type buried layer buried in the p-type substrate, a high voltage n-type well formed on the n-type buried layer and floats electrically, a p-type drift region formed in the n-type well, an n-type drain region and an-type source region formed in the p-type drift region, and a gate electrode formed on a channel region interposed between the n-type drain region and the n-type source region. The high voltage n-type well includes an n-type tunnel region, with a higher impurity concentration than that of the high voltage n-type well, inside a peripheral region formed so as to surround the p-type drift region. 1. A semiconductor integrated circuit device comprising:a p-type substrate to which a ground voltage is applied; anda floating-type NMOS FET which is integrated on the p-type substrate and to which a negative voltage lower than the ground voltage is applied, whereinthe floating-type NMOS FET includes:an n-type buried layer which is buried in the p-type substrate;a high voltage n-type well which is formed on the n-type buried layer and floats electrically;a p-type drift region which is formed in the n-type well;an n-type drain region and an-type source region which are formed in the p-type drift region; anda gate electrode which is formed on a channel region interposed between the n-type drain region and the n-type source region, and whereinthe high voltage n-type well includes an n-type tunnel region, with a higher impurity concentration than that of the high voltage n-type well, inside a peripheral region formed so as to surround the p-type drift region, and whereinthe peripheral edge region of the high voltage n-type well is designed to a width broader than that of the high voltage n ...

Apparatus for Tracking and Recording Vital Signs and Task-Related Information of a Vehicle to Identify Operating Patterns

An apparatus is provided for diagnosing the state of health of a vehicle and for providing the operator of the vehicle with a substantially real-time indication of the efficiency of the vehicle in performing an assigned task with respect to the predetermined goal. A processor on-board the vehicle monitors sensors that provide information regarding state of health of the vehicle and the amount of work the vehicle has done. In response to anomalies in the data from the sensors, the processor records information that describes events leading up to the occurrence of the anomaly for later analysis that can be used to diagnose the cause of the anomaly. The sensors are also used to prompt the operator of the vehicle to operate the vehicle at optimum efficiency.

ASYNCHRONOUS ASYMMETRY COMPENSATION FOR DATA READ FROM A STORAGE MEDIUM

A computer program product, according to one embodiment, includes a computer readable storage medium having program instructions embodied therewith, wherein the computer readable storage medium is not a transitory signal per se, the program instructions executable by a processing circuit to cause the processing circuit to perform a method that includes reading data from a magnetic data storage medium. The processing circuit uses a tracking threshold module to detect and track positive peak amplitudes and negative peak amplitudes of a readback waveform during the data reading. Asymmetry compensation is performed on the data based on input from the tracking threshold module. The asymmetry compensation does not rely on an input except from the tracking threshold module in order to perform the asymmetry compensation. 1. A computer program product , the computer program product comprising a computer readable storage medium having program instructions embodied therewith , wherein the computer readable storage medium is not a transitory signal per se , the program instructions executable by a processing circuit to cause the processing circuit to perform a method comprising:reading, by the processing circuit, data from a magnetic data storage medium;detecting and tracking, by the processing circuit using a tracking threshold module, positive peak amplitudes and negative peak amplitudes of a readback waveform during the data reading; andperforming, by the processing circuit, asymmetry compensation on the data based on input from the tracking threshold module,wherein the asymmetry compensation does not rely on an input except from the tracking threshold module in order to perform the asymmetry compensation.2. The computer program product as recited in claim 1 , comprising program instructions executable by the processing circuit to cause the processing circuit to equalize the data using an equalizer module that executes a least means square (LMS) algorithm in an LMS ...

ERASE DRIVE SYSTEM AND METHODS OF ERASURE FOR TAPE DATA CARTRIDGE

The present disclosure relates generally to writing and reading data from a magnetic tape storage media and, more particularly, to a secure erasure system for the eradication of the data contained in the data tracks of a tape media such that substantially all of the data can be erased while leaving the servo bands substantially unaltered or within specification. A data tape cartridge erased with such a system can then be reused in a secure data storage environment with complete confidence that any data from a previous usage is not subject to discovery. 110.-. (canceled)11. A data erase head comprising:an erase element having a substantially equal or slightly greater magnetic width than a magnetic width of a data band of a magnetic tape media to be erased such that the erase element can substantially fully erase one data band of the tape media in each traverse of the tape media from one end of the tape to the other end of the tape while substantially preserving servo information in servo bands of the tape media, adjacent to the data bands.12. The data erase head of claim 11 , wherein the erase element comprises an erase gap array.13. The data erase head of claim 12 , wherein the erase gap array provides multiple erase exposures of the tape media in a single pass of the tape media.14. The data erase head of claim 11 , wherein the erase element comprises termination patterns on its edges adjacent the servo bands.15. (canceled)16. The data erase head of claim 11 , comprising N/2 erase elements for N data bands of the magnetic media.1729.-. (canceled)30. A method of erasing data from a data band of magnetic tape media claim 11 , comprising:providing an erase element having a substantially equal or slightly greater magnetic width than a magnetic width of a data band of a magnetic tape media to be erased; andsubstantially fully erasing one data band of the tape media with the erase element in each traverse of the tape media from one end of the tape to the other end of the ...

Card Reader and Control Method Therefor

A card reader may include a magnetic sensor to detect whether magnetic data are recorded in the magnetic stripe of the card; a control section to supply electric power to the magnetic sensor and into which an output signal of the magnetic sensor is inputted; and a card insertion port into which the card is inserted and in which the magnetic sensor is disposed. The magnetic sensor may output an output signal when the electric power is supplied from the control section. The control section may supply the electric power to the magnetic sensor during a first supply time period which is shorter than a card passage time period.

Hard Drive Dismantling System

A system and method for reclaiming select components containing rare earth metals of electronic media electronic storage devices such as hard disk drives, solid state drives and hybrid hard drives and destroying the data containing components thereof comprising first devices to loosen various components of the storage device, the components including the components containing the rare earth elements and the data containing portions. Second devices are provided for removing components from the storage device. A holding chassis receives the storage device, and moves the storage device for engagement with the first and second devices. A section is provided for destroying the data containing portion of the electric storage device when it is removed from the storage device. 1. A system for reclaiming select components containing rare earth metals of electronic media electronic storage devices such as hard disk drives , solid state drives and hybrid hard drives and destroying the data containing components thereof comprising:first devices to loosen various components of the storage device, said components including the components containing the rare earth elements and the data containing portions;second devices for removing components from the storage device;a holding chassis for receiving said storage device, and moving the storage device for engagement with said first and second devices; anda section for destroying the data containing portion of the electric storage device when it is removed from the storage device.2. The system of wherein said first devices includes a milling spindle to bore out screws from the cover of the drive.3. The system of wherein said first devices includes a milling tool on the back side of the hard drive to bore out screws holding the drive's circuit board in place.4. The system of wherein said second devices includes a pick and place mechanism for removing the cover and circuit board.5. The system of wherein said second devices include a ...

IN-FIELD LASER CALIBRATION FOR HEAT-ASSISTED MAGNETIC RECORDING HEAD USING TEMPERATURE COMPENSATION EQUATION

A temperature compensation equation is generated during manufacture of a heat-assisted magnetic recording (HAMR) disk drive using initial total currents supplied to a laser diode of the disk drive at different initial operating temperatures. The total currents represent currents for recording data to or erasing data from the medium. The temperature compensation equation is stored in the disk drive, and updated, during field operation, using a subsequent total current associated with an operating temperature differing from the initial operating temperatures. The total current supplied to the laser diode for a subsequent write operation is adjusted using the updated temperature compensation equation in response to the operating temperature at the time of the subsequent write operation. 1. A method , comprising:generating, for a heat-assisted magnetic recording (HAMR) disk drive, a temperature compensation equation that characterizes total currents supplied to a laser diode of the disk drive across a range of operating temperatures of the disk drive, the total currents representative of currents for recording data to or erasing data from a magnetic recording medium;storing the temperature compensation equation in the disk drive;updating the temperature compensation equation using a subsequent total current associated with an operating temperature at the time of the updating; andadjusting, using the updated temperature compensation equation, the total current supplied to the laser diode for a subsequent write operation in response to an operating temperature at the time of the subsequent write operation.2. The method of claim 1 , wherein the temperature compensation equation is updated using the subsequent total current only when the operating temperature is outside of the range of operating temperatures.3. The method of claim 1 , wherein the temperature compensation equation is updated using the subsequent total current when the operating temperature is inside or ...

MAGNETIC DISK DEVICE AND REFRESH PROCESSING METHOD

A magnetic disk device includes a disk with a plurality of data storage tracks, a head that writes data to the plurality of data storage tracks and reads data from the plurality of data storage tracks, and a controller. The controller is configured to circumferentially divide each of the plurality of data storage tracks into multiple count areas, for each count area in each of the plurality of data storage tracks, track a number of adjacent write counts; determine that a first number of adjacent write counts for a first count area in a first data storage track causes a refresh threshold value for the first count area to be exceeded, and in response to determining the refresh threshold value has been exceeded, rewrite data stored in the first data storage track. 1. A magnetic disk device comprising:a disk with a plurality of data storage tracks;a head that writes data to the plurality of data storage tracks and reads data from the plurality of data storage tracks; anda controller configured to:circumferentially divide each of the plurality of data storage tracks into multiple count areas,for each count area in each of the plurality of data storage tracks, track a number of adjacent write counts,determine that a first number of adjacent write counts for a first count area in a first data storage track causes a refresh threshold value for the first count area to be exceeded, andin response to determining that the refresh threshold value has been exceeded, rewrite data stored in the first data storage track.2. The magnetic disk device according to claim 1 ,wherein the first number of adjacent write counts for the first count area indicates a number of times that data has been written to one or more count areas that are radially proximate to the first count area.3. The magnetic disk device according to claim 2 ,wherein the one or more count areas that are radially proximate to the first count area include at least one of a count area that is included in a different data ...

INFORMATION PROCESSING APPARATUS, METHOD OF CONTROLLING THE SAME, PROGRAM AND STORAGE MEDIUM

An information processing apparatus, for recording data in a magnetic storage medium by a shingled magnetic recording, and a method of controlling this, when a rewrite of data stored in the magnetic storage medium is instructed, copy data of a zone in which rewrite target data is stored other than the rewrite target data into a vacant zone of the magnetic storage medium; store, to the vacant zone into which the data is copied, the rewrite target data, delete by overwriting an entirety of the zone in which the rewrite target data is stored with predetermined data, and register the overwritten zone as an unused area. 13-. (canceled)4: An information processing apparatus for recording data in a magnetic storage medium by a shingled magnetic recording , the apparatus comprising:a copy unit configured to, in a case that a deletion of data stored in the magnetic storage medium is instructed, copy data other than deletion target data in a zone in which the deletion target data is stored into a vacant zone of the magnetic storage medium;an overwriting unit configured to overwrite a track of the zone in which the deletion target data is stored with predetermined data; anda registration unit configured to register the track as an unused area,wherein the copy unit, the overwriting unit, and the registration unit are implemented by at least one processor and a memory.5: An information processing apparatus for recording data in a magnetic storage medium by a shingled magnetic recording , the apparatus comprising:a reading unit configured to, in a case that a deletion of data stored in the magnetic storage medium is instructed, read non-deletion target data other than deletion target data positioned after the deletion target data in a zone in which the deletion target data is stored;an overwriting unit configured to overwrite from a head of the deletion target data with the non-deletion target data read by the reading unit; anda registration unit configured to register, as an ...