MAGNETPLATTENGERÄT UND SEIN HERSTELLUNGSVERFAHREN

GERAET ZUR AUFNAHME UND WIEDERGABE VON BINAERINFORMATIONEN AUF EINER MAGNETPLATTE.

Magnetische Übertragungsmethode und -gerät

Method and apparatus to encode position error signal correction information

Magnetic media patterning utilizing heat-induced phase transition

Minimizing settling time in a disc drive servo system

MAGNETIC STORAGE DEVICES

DEVICE AND PROCEDURE FOR DEVELOPING A DYNAMIC SERVO SIGNAL FROM DATA ON A MAGNETIC DISK DRIVE

MAGNETPLATTENSPEICHER

PROCEDURE AND DEVICE FOR THE IDENTIFICATION AND AUTHENTIFIZIERUNG MAGNETIC MEDIA

PROCEDURE FOR THE RECORDING FROM TRACE MARKING INFORMATION ON FLEXIBLE MAGNETIC DISKS AND MECHANISM TO THE FINE POSITIONING OF THE READ HEAD.

DISK DRIVE SYSTEM AND METHOD

DISC MEMORY SERVO INDEXING SYSTEM

Magnetic disc, method of forming its magnetized pattern, and magnetic disc apparatus

SERVO CONTROL SYSTEM USING SERVO PATTERN TIME OF FLIGHT FOR READ/WRITE HEAD POSITIONING IN A MAGNETIC RECORDING SYSTEM

Abstract of the Disclosure An improved servo control system for data track following of the read/write head in a magnetic recording system uses a pattern of segments of servo information slanted across the data tracks. The time of flight of the servo segment from occurrence of a reference pulse until the peak servo signal is read by the head is an indication of the position of the head in a direction perpendicular to the desired track. This time is compared with the known time of flight if the head were precisely over the centerline of the desired track and the time difference is used to generate a control signal to position the head over the track centerline. In an embodiment where each segment is slanted across only one track, the reference pulse is the beginning of the servo signal and the time measurement is the number of fixed frequency magnetic transitions read by the head in the servo segment. When the system is used in flexible disk drives, the servo segments are written in one of the data sectors on the flexible disk by the user's disk drive.

COMBINATION MAGNETIC TRANSDUCER HEAD APPARATUS

Anordnung zur Positionierung mindestens eines Magnetkopfes auf eine Aufzeichnungspur einer Magnetspeicherplatte

Magnetplattenspeicher mit einem Spursteuersystem

Magnetisierbarer Aufzeichnungsträger

Verfahren zur Nachlaufregelung von Magnetköpfen

Eccentricity determination for magnetic disk

Storage media having areas for storing data for correcting servo information errors

Mode d'écriture d'informations de synchronisation sur un support d'enregistrement magnétique

Mode d'écriture d'informations de synchronisation sur un support d'enregistrement magnétique DISC où les informations sont écrites en code binaire et réparties sur une pluralité N de pistes, chaque piste étant associée à au moins une zone de référence ZRPi j qui comprend un groupe d'informations de préambule ZSYi j + ZCAi j un groupe d'informations d'adresses absolues ZADi j et un groupe d'informations de position fine GDPi j Selon l'invention, le mode d'écriture est caractérisé en ce que le groupe d'informations de préambule comprend un premier sous-groupe ZSYi j d'informations de synchronisation précédant un second sous-groupe de contrôle automatique de gain ZCAi j . Applicable aux mémoires magnétooptiques.

POSITIONING DEVICE

System of storage of data

ADAPTIVE BPI AND TPI SELECTING METHOD IN A DISK DRIVE AND A HARD DISK DRIVE USING THE SELECTING METHOD, SPECIFICALLY WITH REGARDS TO VARYING A CAPACITY AND A DATA RATE OF THE HARD DISK DRIVE WHEN DETERMINING THE CAPACITY AND THE DATA RATE

PURPOSE: An adaptive BPI(Bytes Per Inch) and TPI(Tracks Per Inch) selecting method in a disk drive and a hard disk drive using the selecting method are provided to adaptively and optimally vary BPI and TPI values in a disk drive, and to determine the varied BPI and TPI values, thereby increasing productivity of the disk drive while expanding a storage capacity to the maximum. CONSTITUTION: An electric circuit(50) includes a preamplifier(52). Each disk(12) is adjacent to the first head(20A) and the second head(20B). The preamplifier(52) consists of a read data channel(54) and a write data channel(56) connected to a read/write channel circuit(58), and has a read/write enable gate(60) connected to a controller(54). The read/write channel circuit(58) is connected to the controller(54) through each of read/write channels(66,68) and each of read/write gates(70,72). The controller(54) operates according to a software routine including a route of reading or writing data from the disks(12). © KIPO ...

MAGNETIC TRANSFER DEVICE

PURPOSE: A magnetic transfer device is provided to execute accurate magnetic transfer without omitting signals by contacting and housing a master carrier holding transfer information and a slave medium. CONSTITUTION: In a magnetic transfer device for executing magnetic transfer by applying magnetic field for transfer generated by a magnetic field applying device after master carriers(3,4) which bear transfer information and a slave medium(2) receiving transfer are formed by interposing elastic members(6,7) having elastic characteristic between a holder(10) and the master carriers. The micro elastic deformation of the master carriers increases the contact capability with the slave medium. © KIPO 2003 ...

METHOD FOR CHECKING A SERVO BURST SIGNAL IN A HARD DISK DRIVE AND A RECORDING MEDIUM APPROPRIATE THEREFOR, ESPECIALLY RELATED TO EXAMINING A QUALITY OF THE SERVO BURST SIGNAL RECORDED IN THE HARD DISK DRIVE

PURPOSE: A method for checking a servo burst signal in an HDD(Hard Disk Drive) and a recording medium appropriate therefor are provided to detect a servo burst signal recorded with non-uniform intensity as well as a servo burst signal recorded by being shifted from a normal position, thereby effectively managing a quality of the servo burst signals. CONSTITUTION: A controller sets the first test track to a target track, and locates a head on the target track(S1102,S1104). The controller starts searching from a -50% offtrack spot of the target track(S1106), and finds a peak value of the first burst signal(S1108), then stores a size and a position where the peak value is generated(S1110). The controller stores a size and a position where a peak value of the second burst signal is generated(S1112,S1114), and stores a size and a position where a peak value of the third burst signal is generated(S1116,S1118). Among the three burst signals, the controller checks a peak value difference between ...

MAGNETIC RECORDING MEDIUM AND A FABRICATION METHOD OF THE MAGNETIC RECORDING MEDIUM, ESPECIALLY IN CONNECTION WITH EFFECTIVELY RECORDING SERVO INFORMATION, AND REALIZING AN EXCELLENT READING PRECISION OF THE SERVO INFORMATION

PURPOSE: A magnetic recording medium and a fabrication method of the magnetic recording medium are provided to form servo pattern unit portions and servo pattern neighboring portions in different sizes to have different magnetic features, thereby effectively recording servo information while realizing an excellent reading precision by obtaining sufficient output changes. CONSTITUTION: A magnetic recording medium comprises a magnetic layer(12) where information is recorded by being separated into plural data areas(14) and plural servo areas(28). The magnetic layer(12) is separated into plural servo pattern unit portions(30) for configuring predetermined servo patterns and plural servo pattern neighboring portions(32) located around the plural servo pattern unit portions(30). The servo pattern unit portions(30) and the servo pattern neighboring portions(32) are formed in different sizes. © KIPO 2005 ...

METHOD AND APPARATUS FOR FINGERPRINTING AND AUTHENTICATING VARIOUS MAGNETIC MEDIA

Regularized parameter adaptation

An apparatus may include a circuit configured to process at least one input signal using a set of channel parameters. The circuit may adapt, using a regularized adaptation algorithm, a first set of channel parameters for use by the circuit as the set of channel parameters in processing the at least one input signal, the regularized adaptation algorithm penalizing deviations by the first set of channel parameters from a corresponding predetermined second set of channel parameters. The circuit may then perform the processing of the at least one input signal using the first set of channel parameters as the set of channel parameters.

METHOD OF MAGNETIC TRANSFER TO MAGNETIC RECORDING MEDIUM INCLUDING TWO RECORDING LAYERS AND THE MAGNETIC RECORDING MEDIUM

Adaptive track count determination for a self-servowritten disk drive

MEDIA SERVOWRITING SYSTEM

A system and methods for efficiently performing media writing functions is disclosed. The system and methods include: detecting media movement with respect to a base and heads during reading and writing, and moving the heads in response; using an interferometer, such as a dual beam differential interferometer, to dynamically monitor disk position and address perceived errors; and minimizing repeatable and non repeatable runout error by writing data, such as servo bursts, in multiple revolutions to average adverse runout conditions. The present system has the ability to use an interferometer to enhance media certification and perform on line, in situ monitoring of the media, and includes shrouding, head mounting, disk biasing, and related mechanical aspects beneficial to media writing.

SYSTEM AND METHOD FOR CORRECTING INTERFERENCE ERRORS IN DATA ENCODED ON STORAGE MEDIA

L'invention porte sur un système et un procédé visant à corriger des erreurs d'interférence dans des données codées sur un support d'informations sur lequel sont disposés des repères qui sont configurés de façon à coder une pluralité d'adresses de pistes et au moins quatre types de pistes. Un module de correction détecte et corrige des erreurs dans les adresses de pistes en combinant chacune des adresses avec l'un des types de pistes, puis en reconnaissant des adresses incorrectes. Le module de correction remplace des adresses incorrectes par des adresses correctes à l'aide d'une table de consultation, chaque adresse incorrecte étant différente d'une adresse correcte. La pluralité de repères codant les types de pistes sont également utilisés pour générer un signal d'erreur de position en vue de corriger la position d'un dispositif de tête.

METHOD OF RECORDING ON DISK-LIKE RECORDING MEDIUM

L'invention concerne un procédé d'enregistrement dans lequel la surface d'un support d'information maître, sur le côté d'un support d'enregistrement, est courbée vers l'intérieur depuis la périphérie externe jusqu'au centre lorsque le support d'information maître se superpose au support d'enregistrement. Après cette superposition, le support d'information est fermement fixé au support d'enregistrement, enregistrant et transférant ainsi les signaux d'information dans le support d'enregistrement. Ce procédé d'enregistrement comprend une multitude d'applications utilisées dans la production de disques à microcuvettes, tels que les disques magnétiques, magnéto-optiques et optiques, et permet d'enregistrer des signaux d'information de haute densité sur des disques présentant une planéité et une régularité excellentes ainsi qu'une surface propre, l'enregistrement s'effectuant dans un intervalle bref, avec une productivité safisfaisante et de manière uniforme et constante sur toute la surface ...

Base member of disk drive having clock window to write servo track information

A base member of a disk drive having a bottom plate, on which a spindle motor to rotate a disk is mounted, and a side wall positioned along an edge of the bottom plate. The base member has a clock window positioned on the side wall, through which a clock head to write servo track information on the disk is inserted in the disk drive, and a concave adjacent to the clock window and having a predetermined depth relative to an upper surface of the bottom plate, to accommodate the clock head inserted through the clock window.

Template pattern for improving printed media self-servo writing

Template patterns in accordance with the present invention can be applied to improve printed media self-servo writing by reducing PES noise and SAM error-rate at an outer diameter of a reference surface of a disk. In one such template pattern, zig-bursts within a servo wedge describing radial positioning are replaced with pulses at an inner diameter of the reference surface such that head skew at the inner diameter is a limiting factor for pattern frequency at the inner diameter. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

Servo writing transducer design and writing method

A servo writing transducer is shown having transverse side surfaces of the pole pieces adjoining the gap formed to optimize compression of the fringe field at one transverse side to reduce the dead band intermediate servo tracks. The existence of a wider fringe field region at the opposite transverse side is without consequence since the servo writing procedure is to first write the farthest track at the transducer side at which the compressed field occurs followed by each succeeding, adjoining servo track causing the information written in the wide fringe field to be overwritten by the next track.

Magnetic transfer apparatus

By bring a master carrier and a slave medium into close contact with uniform force when executing magnetic transfer by applying transfer magnetic field in the state that the master carrier and slave medium is in confronted close contact and received within a holder, inferiority of transfer such as omission of signals is prevented and quality of transfer signals is enhanced. The magnetic transfer apparatus executes magnetic transfer by applying transfer magnetic field by means of a magnetic field applying apparatus 5 after a master carrier 3, 4 bearing transfer information and a slave medium 2 to be transferred are brought into confronted close contact and received within a holder 10, wherein said holder 10 has a substantially circular shape and in particular, the circularity of holder is not less than 98%, wherein the flexural rigidity=Ed3/12 determined by Young's modulus E and thickness d of the holder is in the range of 0.1˜30 kN·m2when the width of close contact area between the slave ...

Head position error compensation in disk drives

This invention relates to a disk drive and a method of writing data to the disk drive. In a disk drive including a write head, a read head and a positioning unit of a head which includes a write element and a read element, the present invention provides the disk drive with a position error measuring unit for measuring the amount of a position error of the write element and the read element; and a write/read control unit for obtaining an offset amount of the head in accordance with the amount of the position error of the head, setting the offset amount to the positioning unit so as to offset the head, and effecting data write/read operation. When format write operation is executed, only an ID portion is offset in the same direction as the direction of the position error so measured in accordance with the measured amount of the position error, and is written.

Method of magnetic transfer to magnetic recording medium having two recording layers and the magnetic recording medium thereof

A method of magnetic transfer allows transfer of magnetic signals independently to two recording layers included in a magnetic recording medium. The coercive force Hc1 of an upper recording layer, the coercive force Hc2 of a lower recording layer formed below the upper recording layer, the strength Hex2 of a first transfer magnetic field, and the strength Hex1 of a second transfer magnetic field are set so that the following relations hold true: Hc1 Подробнее

Method and apparatus for correcting systematic errors in timing pattern generation

Improvements in placement of timing patterns in self-servowriting include correcting for systematic errors due to geometric effects. A correction is made for varying systematic errors, such as when the recording head has spatially separate read and write elements. Further, servopattern rotation due to residual or unmeasured systematic errors is reduced by using a once per revolution clock index derived from the motor drive current waveform or any other sensor. In one aspect of correcting for systematic errors in the writing of timing patterns on a storage medium of a storage device, a time interval between a trigger pattern written at a first radial position of the storage medium and a rotational index is measured. The rotational index is related to the rotational orientation of the storage medium with respect to a fixed frame of the storage device. The location of another trigger pattern to be written is shifted, using the measured time interval to determine the shift in location for the ...

Optical data storage card

The optical data-storage card includes an optical data-storage medium layer supported on the card. The data-storage medium layer includes a plurality of data storage tracks for storing data therein. Each of the tracks having at least an arc-segment wherein each of the data storage tracks being substantially parallel to a neighboring track.

Magnetic disk apparatus, method for determining data track pitch, and self-servo write method

A self-servo reference signal including a timing pattern and an oblique phase pattern is transferred in advance on a magnetic disk 1 by magnetic printing. A phase difference detection section 13 detects a phase difference between the two patterns to detect the position of a magnetic head 2 . A burst signal generated by a record signal generation section 14 is recorded in a region of the magnetic disk 1 where no self-servo reference signal is recorded. A track pitch calculation section 11 determines a relationship between the reproduction output of the burst signal detected by a reproduction signal processing section 12 and the phase difference detected by the phase difference detection section 13 , thus calculating an optimum data track pitch.

Servo demodulator systems including multiple servo demodulators

Servo demodulation systems including multiple servo demodulators are provided. A first servo demodulator is adapted to search for a servo address mark (SAM) pattern using a first set of servo demodulation detection parameters. A second servo demodulator is adapted to search for the SAM pattern using a second set of servo demodulation parameters, wherein at least one servo demodulation parameter in the second set is different than a corresponding parameter in the first set. Example servo demodulation parameters include staring automatic gain control (AGC) values and starting phase lock loop (PLL) values.

Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same

A magnetic medium comprises a magnetic disc having a read surface that has a plurality of tracks, at least some having servo sectors. The servo sectors comprise a plurality of magnetic irregularities, such as pits or regions of reduced magnetic coercivity, arranged in a servo pattern along the servo sector at a servo frequency. A magnetic pattern is recorded in the disc along the servo sector at a high carrier frequency. A process for manufacturing the servo pattern and for recovering servo data from the servo pattern are also described.

Servo track writing using extended copying with head offset

The present invention proposes a new servo track writing technique called Extended Copying with Head Offset ("ECHO"). The read and write elements of the read/write head are offset from each other. A servo writer writes a guide pattern on the magnetic media disc. ZAP correction factors are added to the guide pattern. The head disc assembly is then connected to an electrical control system for self-propagating servo writing. The actuator arm is displaced until the read head is aligned over the guide pattern. A new servo track is written by the write element. ZAP correction factors are added to the newly written servo track. The actuator arm is displaced until the read element is aligned with the newly written servo track. A new servo track is written. ZAP correction factors are added to the newly written servo track. The process is repeated until a desired number of servo tracks are written.

Method for constrained implementation of variable data TPI

The present invention comprises an implementation of a variable data TPI hard drive system. In one embodiment, the system is implemented by configuring a group of servo tracks in a radial direction for a hard drive media. The group is comprised of an integral number of servo tracks that is constant throughout the drive device. The number of data tracks in a group is also an integer but will vary for each surface according to the head used for R/W operations for each media surface. Group boundaries coincide with media surface R/W zone boundaries. The groups are accessed in hard drives having multiple surfaces in a serpentine manner. Data tracks per group are reduced from what is achievable to produce desired target capacities.

Apparatus and methods of generating a test pattern of data, analysing a test pattern of data, and testing a data storage disk medium and/or a read/write head

A method of generating a test pattern of data to be written to a data storage disk medium for testing includes: rotating the disk; detecting fluctuations in the speed of rotation of the disk; producing a reference clock signal in accordance with the fluctuations so as to be synchronized with the rotation of the disk; and, generating a test pattern of data using the reference clock signal as a timing reference. An apparatus for generating a test pattern of data includes a spindle for rotating a disk; a detector arranged to detect fluctuations in the speed of rotation of the disk; a processor arranged to produce a reference clock signal in accordance with fluctuations so as to be synchronized with the rotation of the disk; and, a pattern generator arranged to generate a test pattern of data using the reference clock signal as a timing reference.

SELF-SERVO WRITING USING RADIALLY OVERLAPPED SERVO SEGMENTS

In accordance with various embodiments, initial servo data are written to a storage medium as a series of radially overlapped spiral segments. Final servo data are thereafter written to the medium while concurrently servoing on said overlapped segments.

Method and apparatus for reducing velocity errors when writing spiral servo information onto a disk surface

The present invention is directed to a method and apparatus for reducing velocity errors when writing spiral servo information onto a disk surface of a disk drive. In one embodiment, a servo track writer is provided for moving a write head at a controlled velocity. The write head is used to write spiral servo information onto a disk surface. The write head is moved, using the servo track writer, at an actual velocity trajectory to simulate writing one spiral of spiral servo information. Differences between the actual velocity trajectory and a desired velocity trajectory are measured on a control sample by control sample basis over a window of control samples. The differences are integrated over the window. A gain, associated with the servo track writer controlling the velocity of the write head, is adjusted using the integrated differences.

MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE

According to one embodiment, a magnetic recording medium includes a substrate and a single domain magnetic dot. The single domain magnetic dot is provided on the substrate and is written with a compensation signal for controlling the position of at least one of a recording device and a reproducing device. The single domain magnetic dot has a length in the radial direction of the substrate shorter than a length in the circumferential direction of the substrate.

Seamless and untrimmed primary servo burst with multiple secondary servo bursts

A disk storage system having servo data stored thereon for accurate head position control over a magnetic or other storage medium. The servo data is seamless and untrimmed and consists of a primary servo burst set (AB burst) in which the difference defines the desired tract pitch for the surface. Multiple secondary servo burst sets (e.g., CD burst and EF burst) are written at the desired track pitch but radially offset from the primary burst set. In one embodiment, two secondary servo burst sets are used, but alternatively, any number of secondary servo burst sets could be used. In this exemplary embodiment having two secondary servo burst sets, the CD servo burst set is offset by 1/3 of the track pitch from the primary servo burst set. Also in this embodiment, the EF servo burst set is offset by 2/3 of the track pitch from the primary servo burst set. There are six bursts per set. The servo data is written in multiple servo sectors around the surface of the medium. From the servo data, ...

Amplitude servo pattern, magnetic recording medium and the manufacturing method, patterned magnetic transfer master substrate used in the manufacturing method, and magnetic recording/reproducing apparatus

An amplitude servo pattern capable of providing accurate servo control through reproduced amplitude with reduced noise is provided. In an amplitude servo pattern 10 that has servo burst signals composed of burst bit strings 11, 12 disposed in a track width direction r, the adjacently disposed servo burst signals in the track width direction r have a phase difference +¦ with each other in a track direction x. Preferably, the phase difference is in the range from 90 to 180 degrees. It is desirable that the amplitude servo pattern is recorded on the magnetic recording layer of a magnetic recording medium through magnetic transfer.

Magnetic transfer method and apparatus

A favorable magnetic transfer is performed on a vertical magnetic recording medium. A permanent magnet apparatus (5) employs a transfer magnetic field generating means provided with two columnar permanentmagnets (5a,5b), each having a cross-sectional surface are equal to or greater than that of the track surface of the slave medium. A conjoined body (10) formed of a slave medium (2), which has been initially magnetized unidirectionally in the direction perpendicular to the track surface thereof, and two master mediums (3,4), disposed on respective surfaces of the slave medium, is inserted between the permanent magnets so that a transfer magnetic field can be applied thereto in the direction substantially opposite that in which the initial magnetization (Hin) has been performed. A uniform transfer magnetic field (Hdu) is applied over the entirety of track surface of the slave medium so as to simultaneously perform a magnetic transfer over the entirety of the track surface.

Magnetic disc unit

A step h is provided between a recording region 2 including servo patterns Ps1, Ps2 and the recording track pattern Pw and a non-recording region 3 except the servo patterns Ps1, Ps2 and the recording track pattern Pw. A relation between a servo pattern width Ts and a track pitch Tp is set to be Tp(n - 0.1) ¿ Ts ¿ Tp(n + 1) , while a relation between a magnetic readout width Wr of the magnetic head and the track pitch Tp is set to be 0.9 Tp ¿ Wr ¿ 1.1 Tp. A dead zone in a tracking error signal indicating a position of a magnetic head is to be eliminated, thus rendering it possible to position the magnetic head accurately and speedily.

Device for improving the intelligibility of audio signals containing speech

A favorable magnetic transfer is performed on a vertical magnetic recording medium. A permanent magnet apparatus (5) employs a transfer magnetic field generating means provided with two columnar permanentmagnets (5a,5b), each having a cross-sectional surface are equal to or greater than that of the track surface of the slave medium. A conjoined body (10) formed of a slave medium (2), which has been initially magnetized unidirectionally in the direction perpendicular to the track surface thereof, and two master mediums (3,4), disposed on respective surfaces of the slave medium, is inserted between the permanent magnets so that a transfer magnetic field can be applied thereto in the direction substantially opposite that in which the initial magnetization (Hin) has been performed. A uniform transfer magnetic field (Hdu) is applied over the entirety of track surface of the slave medium so as to simultaneously perform a magnetic transfer over the entirety of the track surface.

Servowriter system for magnetic disc drives

A portable servowriter system for writing a closed clock track and servo tracks on one or more of the fixed discs of a fixed disc magnetic disc drive without the aid of a mechanical head positioner; and which is also capable of writing a closed clock track and servo tracks (either on a dedicated disc surface or of the embedded form) on one or more of the discs of a rotating disc magnetic disc drive with the aid of a mechanical positioner.

HEAD POSITIONING CONTROL METHOD/DEVICE FOR MEMORY DISK

PROBLEM TO BE SOLVED: To save a lot of time to seek for a position signal even if a head is changed-over to another in a head positioning method and a device therefor in which the positions of the position signals between the heads are ununiform. SOLUTION: This device is provided with a memory disk 1 for storing positional signals, plural heads 3a-3d for reading the information of the memory disk 1, an actuator 5 for moving the heads, and a control circuit 11 for positioning the head based on the positional signal read by a selected head from the memory disk. This control circuit 11 has a synchronization circuit 6 for synchronizing the time of an detection signal for detecting the positional signal with the time of a positional signal to be read by the head to be changed over to, according to the head change-over instruction, and a processing circuit 11 for reading the positional signal of the head according to the synchronized detection signal, and positioning the head according to the ...

Datenspeichermagnetband mit geätzter Servospur

Aktives magnetisches Lagersystem für eine verbesserte Servosteuerung

VERFAHREN ZUR ERZEUGUNG EINER BESTIMMTEN VERTEILUNG MAGNETISCHER TEILCHEN

Urinformationsträger für magnetische Übertragung

Verfahren zum magnetischen Aufzeichnen und Wiedergeben von Daten, magnetischer Auzeichnungsträger, sein Herstellungsverfahren und Gerät zur magnetischen Aufzeichnung

Magnetischer Aufzeichnungsträger und Verfahren zum magnetischen Aufzeichnen und Wiedergeben von Daten.

Disc drive servo track writer utilizing low-density gas

Method and apparatus for thermally writing servo patterns on magnetic media

A method (200) and apparatus (300) for thermally writing a magnetic servo pattern (150, 270, 400, 500, 600, 650, 700) on a magnetic disc medium (204, 314, 670) prior to assembling the medium (204, 314, 670) in a disc drive (100) are provided in which the medium (204, 314, 670) is first magnetized in a uniform magnetization direction (206, 408). A plurality of magnetic domains (220, 250, 252, 272, 410-414, 501-503, 602, 604, 651-653, 710-712) are then thermally written on the medium (204, 314, 670), on magnetic domain at a time, by individually heating each magnetic domain with a light beam (212, 312, 672) while exposing the magnetic domain to a magnetic field (209, 674). The magnetic field (209, 674) has an orientation (216, 415) that is opposite to the uniform magnetization direction (206, 408). The light beam (212, 312, 672) forms an illumination pattern (214, 678) on the medium (204, 314, 670) having a shape that at least partially defines a boundary of each magnetic domain (220, 250 ...

Method for writing servo signals onto a magnetic disk and magnetic disk drive equipped with magnetic disk (s) having servo pattern recorded by the method

DISK DRIVING DEVICES

Method and apparatus for servo positioning in a direct access storage device

A phase modulated servo method and apparatus provides acceptable position linearity for servo positioning with a narrow transducer head in a disk file. The disk file includes at least one disk mounted for rotation about an axis and the disk has at least one disk surface for storing data and has a transducer mounted for movement across the disk surface for writing to and for reading data and servo patterns from the disk surface. The transducer includes a read element and a write element. The read element has a width less than the write element and the read element width is greater than 113 of a data cylinder and less than 1/2 of a data cylinder. A servo pattern is written on the data disk surface having a track pitch of less than 1/2 of a data cylinder and the servo pattern repeats in a selected binary number of data cylinders. ...

Method and apparatus for servo positioning in a direct access storage device

Attaching a disc to a spindle of a spinstand

Apparatus for attaching a disk 5 to a spindle 4 of a spinstand (1) has a spindle adapter 40. The spindle adapter has a drawbar 41 movably disposed within. The drawbar has a connector end 42 that is reversibly connectable to the cap 60 and has a piston 44 that is connectable to a source of fluid pressure. The drawbar is movable in response to fluid pressure so as to urge together the cap 60 and the spindle adapter 40 when connected. The cap and the spindle adapter hold the disk therebetween. In another arrangement, a movable stage movable over a deck (2) of a spinstand (1) has a lift stage (80) arranged to hold a cap 60 with a disk 5 positioned thereon. The lift stage (80) has at least one actuator for raising the lift stage so that the cap can be connected with a spindle adapter of a spindle of a spinstand.

METHOD OF SETTING MAGNETIC HEADS

... 1321196 Recording and playback INTERNATIONAL BUSINESS MACHINES CORP 23 April 1971 [22 June 1970] 10906/71 Heading G5R A method of aligning the heads in a disc pack recording apparatus comprises the steps of using a single head to record reference signals at the same radial position on the surfaces of each of a series of discs taken in turn, assembling the discs to form a disc pack, mounting the pack in the recording apparatus and then adjusting each head therein to the position corresponding to the appropriate reference signals. In the preferred method the reference signals are recorded in two adjacent tracks and the heads being aligned are adjusted to the centre point between the reference tracks; in addition, the reference recording head is positioned optically.

EQUIPMENT FOR THE DEVELOPMENT OF A DYNAMIC SERVO SIGNAL FROM DATA IN A MAGNETIC DISK DRIVE ASSEMBLY AND PROCEDURE

Control equipment for the exact attitude of a solenoid actuator on a selected data track

PROCEDURE FOR VORAUFZEICHNUNG OF POSITIONING INFORMATION ON MAGNETIC RECORDING CARRIERS.

MAGNETIC PLATE STORAGE

DISK STORAGE APPARATUS

Servo sector allocation for high sampling rate

伺服写入方法和具有伺服控制系统的盘驱动器

... 本发明涉及伺服写入方法和具有伺服控制系统的盘驱动器。在一种盘驱动器中，盘介质包括其上记录伺服数据的伺服区(100)和其上记录数据的数据区(110)。在每个数据磁道，例如盘介质的外径中，记录在伺服区(100)上的伺服数据的倾斜度θ2小于记录在数据区(110)上的数据的倾斜度θ1。 ...

PROCESS Of WRITING Of INFORMATION ON a SUPPORT Of RECORDING

MAGNETIC RECORD WITH SERVO TRACK PERPENDICULAR TO INFORMATION TRACK

PROCESS AND DEVICE OF MEMORIZING ON MAGNETIC DISK

CREATING AN INITIAL SET OF TRACKS IN A SELF-SERVOWRITING SYSTEM USING A COMPLIANT CRASHSTOP TO CONTROL HEAD MOVEMENT

BASE MEMBER OF A DISK DRIVE WHERE A CLOCK WINDOW FOR SERVO TRACK WRITING IS FORMED, SPECIFICALLY IN REFERENCE TO SUFFICIENTLY OBTAINING AN AREA FOR ADHERING A SEALING TAPE TO A SIDEWALL SIDE OF THE BASE MEMBER WITHOUT CUTTING A PORTION OF A COVER MEMBER

PURPOSE: A base member of a disk drive where a clock window for servo track writing is formed is provided to form a clock window on a sidewall of the base member without deteriorating rigidity of the base member, thereby easily performing a servo track writing process while maintaining the rigidity of the base member. CONSTITUTION: A clock window(160) is formed on a sidewall(112) of a base member. A concave groove(162) connected with the clock window(160) is formed on an upper side of a bottom plate(111) of the base member. The concave groove(162) is formed in concave type to receive a clock head(170) inserted through the clock window(160). A lower side of the clock window(160) is horizontally extended up to the bottom plate(111), to form a lower side of the concave groove(162). © KIPO 2005 ...

REFERENCE PATTERN FORMING METHOD TO CORRECT A DEFECTIVE REFERENCE PATTERN

PURPOSE: A reference pattern forming method is provided to prevent disposal of a disc drive or reprocessing of a defective reference pattern in a servo copy device by correcting a defective reference pattern. CONSTITUTION: A reference pattern forming method is as follows. It determines whether the boundary of an initial reference pattern is positioned in the inner area of a disc based on the outermost perimeter track(315). If the boundary point of the first standard pattern is positioned in the inner area, a corrected reference pattern is created by expanding the initial reference pattern toward the outer track of the disc(320). © KIPO 2009 ...

CREATING AN INITIAL SET OF TRACKS IN A SELF-SERVOWRITING SYSTEM USING A COMPLIANT CRASHSTOP TO CONTROL HEAD MOVEMENT

WRITING REPEATING PATTERNS OF FEATURES TO A SUBSTRATE

Method (200, 240) and apparatus (140, 260) for writing repeating patterns of features ( 106, 160) to a substrate (102, 142), such as a data storage medium. In accordance with some embodiments, a multi-dimensional pattern of discrete features of different sizes (162, 164, 166, 182, 184, 186, 188, 190, 222, 224, 226, 228, 230) to be written to a substrate is divided into a plurality of contiguous regions (206, 232, 244). A unique set of compensation values is assigned to each region (208, 246). A write beam of a write system (140, 270) is used to write the features to the substrate responsive to said unique sets of compensation values so that all of the features having a common size in at least one region are written using the same compensation values from the associated set (212, 250).

MEDIA SERVOWRITING SYSTEM

A system and methods for efficiently performing media writing functions is disclosed. The system and methods include: detecting media movement with respect to a base and heads during reading and writing, and moving the heads in response; using an interferometer, such as a dual beam differential interferometer, to dynamically monitor disk position and address perceived errors; and minimizing repeatable and non repeatable runout error by writing data, such as servo bursts, in multiple revolutions to average adverse runout conditions. The present system has the ability to use an interferometer to enhance media certification and perform on line, in situ monitoring of the media, and includes shrouding, head mounting, disk biasing, and related mechanical aspects beneficial to media writing.

Magnetic recording medium, magnetic recording/reproducing apparatus and method for manufacturing metallic mold for molding disc

A magnetic recording medium having pits corresponding to servo signals and grooves extending along recording tracks, in which a magnetic head undergoes only little variations in its floating amount during recording/reproduction. The ratio Lw/Gw, where Lw is the width of a land 4 as a protuberant portion between neighboring grooves 3 and Gw is the width of the groove 3, is set so as to be not less than 2.0.

Systems and methods for two-step reference pattern self-servowriting

A two-step self-servowriting process first writes an intermediate pattern based on a reference pattern, and then writes a final pattern based on the intermediate pattern, wherein the reference pattern can be a printed media or a spiral pattern. Such an approach can be utilized to reduce the noise/runout, eliminate timing eccentricity, and increase the sample rate of the final pattern. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

HARD DISK DRIVE, MANUFACTURING METHOD OF THE SAME, AND SERVO DATA WRITING METHOD

A method for writing servo data includes writing servo data as a head moves outward on a disk one step at a time, so as to overwrite part of servo data that have been written in a previous step, writing servo data as the head moves inward on the disk one step at a time, so as to overwrite part of servo data that have been written in a previous step, and writing one of two-phase burst data, or address data and the other of said two-phase burst data, at the radial position, so as to overwrite at least part of servo data written in each last step of the writings as the head moves outward and inward. The same address data are written in two consecutive steps as the head moves outward and as the head moves inward.

Magnetic transfer master medium

In the performance of a magnetic transfer utilizing a magnetic transfer master medium, the occurrence of signal omissions in the magnetic data transferred to the slave medium is prevented. By forming the protrusion portions of the uneven pattern formed on the surface of the master medium so that the width thereof in the direction of the track pitch is narrower than said track width, no depression portions that are surrounded on all four sides by protrusion portions are formed.

Bootstrap method for writing servo tracks on a disk drive

A method for defining and writing parallel and concentric magnetic signal tracks to a spinning disk surface of a magnetic data storage disk drive system using the components of the Head Disk Assembly (HDA) implemented by an appropriately programmed digital signal central processing unit (CPU) or micro code in an integrated circuit (IC) and a digital signal random access memory RAM is described wherein an initial magnetic signal track is written under least (minimum) energy equilibrium conditions with undulating boundaries and a meandering center line relative to axes of the spinning disk surface for one revolution of the surface. Then servoing to an edge of the just written track, a digitized position signal table is created in memory for storing digital position signals representing the amplitude of the signals read from n sampling points per disk revolution over a number of disk revolutions, where n is determined with reference to `Nyquist criteria`. A comparison/demand signal is derived ...

Method for writing servo signals onto a magnetic disk and magnetic disk drive equipped with magnetic disk(s) having servo pattern recorded by the method

A method for recording servo patterns in a magnetic disk drive and a magnetic disk drive for executing such a method are provided. A magnetic disk on which a clock signal has been recorded in at least a part thereof is mounted into the magnetic disk drive. The clock signal is read out from the magnetic disk by using a data recording/reproducing magnetic head. A servo pattern is further recorded by using the recording/reproducing magnetic head on the basis of the read-out clock signal.

Servo system for providing increased recording density and improved operation of the AGC circuitry

A servo system for use in a magnetic recording media is disclosed, with the system utilizing short and long address tracks in a predetermined pattern to increase the usable data storage space on the media. A special pattern is utilized following the A and B BURST patterns for each track on the disk to assist in calibration of the drive. In addition, a special pattern is provided preceding the track address portion of the sectors to identify the associated track address as being a long address, a short address or as the origin sector.

Method and apparatus for servo control with high efficiency gray code for servo track ID

A gray code is provided for use with disk servo track identification encodement that preserves the gray code property of only a single digit changing state between two numbers in the code sequence and also preserves magnetization between code numbers while only requiring a single bit for encoding each code value by recording a single pad bit before the gray code bits. By proper selection of the sign of the pad bit and the gray code numbering sequence, the gray code encodement scheme uses n+1 code bits for an n-bit gray code. The efficiency of the gray code encodement can be enhanced by splitting the track identification number to be recorded into multiple fields and then recording only the low order bits sufficient to identify a track within the maximum estimated error of the servo head on every track and otherwise alternating the high and low middle order bit fields with the low order bit field. A run-length limiting feature also can be provided. One way is for the encoded bits to be broken ...

Multi-signal realignment for changing sampling clock

An apparatus may include a circuit configured to receive first and second samples of an underlying data from respective first and second sample periods and which correspond to respective first and second sensors, a phase control value may have first and second values during respective first and second sample periods. The phase control value may be a control value for a sample clock signal. The circuit may also determine a difference in the phase control value between the first value and the second value. The circuit may then digitally interpolate the first and second samples to produce a phase shifted first and second samples where the digital interpolation of at least one of the first and second samples mat be at least in part based on the difference in the phase control value to compensate for a phase misalignment between the first sample and the second sample.

HARD DISK DRIVE

According to one embodiment, there is provided a hard disk drive including a first recording surface, a second recording surface, a first magnetic head, a first actuator and a second actuator that move the first magnetic head, a second magnetic head, a third actuator and a fourth actuator that move the second magnetic head, a fifth actuator that moves the second actuator and the fourth actuator, a drive circuit that implements at least one of a first mode in which the second actuator and the fourth actuator operate differently from each other or a second mode in which the first and third actuators operate differently from each other, and a controller that controls the drive circuit. 1. A hard disk drive comprising:a first recording surface;a second recording surface;a first magnetic head that performs reading/writing on the first recording surface;a first actuator that moves the first magnetic head;a second actuator that moves the first magnetic head and the first actuator in an integrated manner;a second magnetic head that performs reading/writing on the second recording surface;a third actuator that moves the second magnetic head;a fourth actuator that moves the second magnetic head and the third actuator in an integrated manner;a fifth actuator that moves the second actuator and the fourth actuator in an integrated manner;a drive circuit that implements at least one of a first mode in which the first actuator and the third actuator perform same operation and the second actuator and the fourth actuator perform different operations or a second mode in which the second actuator and the fourth actuator perform same operation and the first actuator and the third actuator perform different operations; anda controller that controls the drive circuit.2. The hard disk drive according to claim 1 , whereinthe drive circuit includes a plurality of switches that switches a switching state to select, from the first actuator, the second actuator, the third actuator, and the ...

HARD DISK DRIVE AND HEAD POSITIONING METHOD

According to one embodiment, a hard disk drive includes a disk including a plurality of data areas, and a plurality of servo areas between the plurality of data areas, an arm holding a write head and a read arm, and a positioning module which positions the read head or the write head by rotating the arm, wherein the positioning module positioning the write head by positioning the read head, and adjusting a position of the read head or the write head, based on an output of the read head located in a data area between two servo areas adjacent in a peripheral direction, of the plurality of servo areas. 1. A hard disk drive , comprising:a disk comprising a plurality of data areas, and a plurality of servo areas between the plurality of data areas;an arm holding a write head and a read arm; anda positioning module which positions the read head or the write head by rotating the arm,wherein the positioning module positions the write head by positioning the read head, and adjusts a position of the read head or the write head, based on an output of the read head located in a data area between two servo areas adjacent in a peripheral direction, of the plurality of servo areas.2. The hard disk drive of claim 1 , whereinthe positioning module calculates a bit error rate of read data from the read head or a frequency characteristic of a read signal from the read head, and adjusts the position of the read head or the write head, based on the bit error or the frequency characteristic.3. The hard disk drive of claim 1 , further comprising a variable gain amplifier which amplifies a read signal from the read head claim 1 ,wherein the positioning module adjusts the position of the read head or the write head, based on a gain of the variable gain amplifier.4. The hard disk drive of claim 1 , whereinthe disk comprises a plurality of concentric tracks, andthe positioning module adjusts the position of the read head or the write head, based on the output of the read head, when same data ...

Servo integrated bpm template

Provided herein is a method including forming a data zone guiding pattern and forming a servo zone guiding pattern. A servo pattern and a data pattern are simultaneously formed. Directed self-assembly of block copolymers is guided by the data zone guiding pattern and the servo zone guiding pattern.

Recording device, control device, recording method, recording tape cartridge, and data recording and reproducing system

A recording device, a control device, a recording method, a recording tape cartridge, and a data recording and reproducing system capable of accurately positioning a data recording and reproducing head are obtained. A recording device includes a recording unit that records information on linearity of a servo signal recorded on a magnetic tape included in a recording tape cartridge on an RFID tag included in the recording tape cartridge.

Adaptive guard band for improved data storage capacity

An adaptive guard band for a ramp load/unload device is disclosed to provide extended data storage. In illustrated embodiments, an adaptive guard band algorithm is configured to format one or more discs or media having a lower capacity device with the adaptive guard band and extended data zone utilizing capacity measurements. The algorithm formats the media to provide a track zero at a first cylinder if the capacity is at or above the threshold capacity and a second cylinder if the capacity is below the threshold capacity to provide the extended data storage zone. A size or width of the extended data zone is variable to provide additional capacity to meet the threshold capacity.

MAGNETIC TAPE DEVICE AND HEAD TRACKING SERVO METHOD

The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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, the magnetic layer includes a servo pattern, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30. 1. A magnetic tape device comprising:a magnetic tape; anda servo head,wherein the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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,the magnetic layer includes a servo pattern, anda coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.2. The magnetic tape device according to claim 1 ,wherein the coefficient of friction measured regarding the base portion of the surface of the magnetic layer is 0.20 to 0.30.3. The magnetic tape device according to claim 1 ,wherein a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm.4. The magnetic tape device according to claim 3 ,wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm.5. The magnetic tape device according to claim 1 ,wherein the magnetic tape includes a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer, anda total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.8 μm.6. The ...

HARD DISK DRIVE, MANUFACTURING METHOD OF THE SAME, AND SERVO DATA WRITING METHOD

A method for writing servo data includes: writing the servo data as the head moves outwardly towards a radial position on the disk one step at a time, wherein the same address data are written as the head moves outwardly in two consecutive steps, writing the servo data as the head moves inwardly towards the radial position one step at a time, so as to overwrite part of servo data that have been written in a previous step, wherein the same address data are written as the head moves inwardly in two consecutive steps, and writing either one of two-phase burst data, or address data and the other of said two-phase burst data, at the radial position. 1. A method for writing servo data , including address data and a pair of two-phase burst data , on a disk using a write element of a head , comprising:writing the servo data as the head moves outwardly towards a radial position on the disk one step at a time, so as to overwrite part of servo data that have been written in a previous step, wherein the same address data are written as the head moves outwardly in two consecutive steps;writing the servo data as the head moves inwardly towards the radial position one step at a time, so as to overwrite part of servo data that have been written in a previous step, wherein the same address data are written as the head moves inwardly in two consecutive steps; andwriting either one of two-phase burst data, or address data and the other of said two-phase burst data, at the radial position, so as to overwrite (i) at least part of servo data written in a last step of the writing as the head moved outwardly or (ii) at least part of servo data written in a last step of the writing as the head moved inwardly.2. The method according to claim 1 , whereinwhen the step number is an even number, said one of two-phase burst data are written at the radial position, andwhen the step number is an odd number, said address data and the other of said two-phase burst data are written at the radial ...

RECORDING MEDIUM, A DATA STORAGE APPARATUS AND A METHOD OF PREPARING A RECORDING MEDIUM

In the present disclosure, a recording medium and a method of preparing a recording medium is provided. In a recording medium, a first annular servo track can be provided on a first layer of the recording medium, and second annular servo track can be provided on the first layer of the recording medium. The second annular servo track can be adjacent to the first annular servo track. In the recording medium, the first annular servo track and the second annular servo track are magnetically polarized and are magnetically opposing in polarity. A corresponding method of preparing a recording medium is provided. 1. A method of preparing a recording medium comprising:writing a first annular servo track on a first layer of the recording medium, the first annular servo track having a magnetic polarization of a first direction; andwriting a second annular servo track on the first layer of the recording medium, the second annular servo track having a magnetic polarization in a second opposite direction, the second track adjacent to the first track.2. The method according to claim 1 , wherein writing a first annular servo track comprises polarizing magnetic bits in a unidirectional positive polarization claim 1 , and writing a second annular servo track comprises directionally polarizing magnetic bits in a unidirectional negative polarization.3. The method according to claim 1 , wherein writing the first annular servo track comprises passing an electrical current through a write element for magnetizing a magnetic bit.4. The method according to claim 3 , wherein writing the first annular servo track comprises passing a positive direct current through the write element claim 3 , and writing the second annular servo track comprises passing a negative direct current through the write element.5. A data storage apparatus comprising: 'a data track provided on a data layer, corresponding to a first servo track and a second servo track provided on a servo layer, the first servo track and ...

Data Storage Device with High Signal-to-Noise Ratio Contact Detection

A data storage device may have increased signal-to-noise ratio contact detection by employing a transducing head associated with a data storage medium each connected to a controller. The transducing head can have an alternating current heater excited to a first frequency for a first revolution of the data storage medium and to a different second frequency for a second revolution of the data storage medium. The second frequency may produce lateral transducing head motion as a result of physical contact of the transducing head with the data storage medium. The controller can issue a contact status in response to comparing a first plurality of position error signals logged during the first frequency to a second plurality of position error signals logged during the second frequency. 1. An apparatus comprising a transducing head assembly separated from a data storage medium by an air bearing , the transducing head assembly receiving an alternating current as directed from a controller , the alternating current configured to induce random transducing head motion when the air bearing has a greater than zero size and cyclical transducing head motion when the air bearing has a zero size.2. The apparatus of claim 1 , wherein the alternating current is in the range of 4-10 kHz.3. The apparatus of claim 1 , wherein the alternating current has a frequency that is greater than a bandwidth of a voice coil motor of a suspension portion of the transducing head assembly.4. The apparatus of claim 1 , wherein the alternating current has a frequency that is greater than a thermal time constant of a transducing head portion of the transducing head assembly.5. The apparatus of claim 1 , wherein the transducing head motion is measured by the controller as a distance from a from a longitudinal axis of a transducing head portion of the transducing head assembly to a data track centerline.6. The apparatus of claim 1 , wherein the air bearing has a constant size while the alternating current ...

MAGNETIC TAPE DEVICE AND HEAD TRACKING SERVO METHOD

The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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, the magnetic layer includes a servo pattern, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30. 1. A magnetic tape device comprising:a magnetic tape; anda servo head,wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec,the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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,the magnetic layer includes a servo pattern, anda coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.2. The magnetic tape device according to claim 1 ,wherein the coefficient of friction measured regarding the base portion of the surface of the magnetic layer is 0.20 to 0.30.3. The magnetic tape device according to claim 1 ,wherein a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm.4. The magnetic tape device according to claim 3 ,wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm.5. The magnetic tape device according to claim 1 ,wherein the magnetic tape includes a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer, anda total ...

Shingled Magnetic Recording with Operational Based Track Spacing

A data storage device can employ shingled magnetic recording with data tracks oriented in order to optimize operational parameters, such as bit error rate. A data storage device can consist of a plurality of data tracks overlapping in a band on a data storage medium. First, second, and third data tracks of the band can be respectively separated by a uniform first track pitch during testing the band for an operational parameter. The first track pitch may then be adjusted to provide at least two different adjusted track pitches with each track pitch measured between longitudinal centerlines of adjacent data tracks of the band.

Magnetic disk device

According to one embodiment, a magnetic disk device includes a disk including a first region and a second region different from the first region, a head that writes data on the disk and reads data from the disk, an actuator that positions the head on the disk, and a controller which positions the head by driving the actuator and writes data in the first region and the second region with the head, a skew angle of the head with respect to a circumferential direction of the disk varying within a first angle in the first region, and varying, in the second region, from a second angle larger than the first angle to a third angle larger than the first angle and the second angle.

Chemical Pinning to Direct Addressable Array Using Self-Assembling Materials

A substrate having an arrangement of self-assembling magnetic domains and a method of fabrication therefor. In some embodiments, a substrate is patterned with a plurality of chemically contrasted alignment features, and a block copolymer having a magnetic component and a non-magnetic component is deposited onto the substrate. The block copolymer self-assembles into a sequence of magnetic domains responsive to the alignment features. The period of the alignment features is between about 2 times and about 10 times the period of the magnetic domains. 1. A method comprising:patterning a substrate with a plurality of chemically contrasted alignment features; and{'b': 2', '10, 'depositing a block copolymer having a magnetic component and a non-magnetic component onto the substrate, the block copolymer self-assembling into a sequence of magnetic domains responsive to the alignment features, the period of the alignment features being between about times and about times the period of the magnetic domains.'}2. The method of claim 1 , wherein the patterning step comprises applying a polymer brush layer to the substrate claim 1 , coating the brush layer with a photoresist layer and applying a lithographic process to form the plurality of chemically contrasted alignment features.3. The method of claim 1 , in which the magnetic domains are spherical.4. The method of claim 1 , in which the magnetic domains are characterized as cylinders.5. The method of claim 1 , in which the alignment features comprise a regular pattern in a data area and a non-regular pattern in a servo area.6. The method of claim 1 , in which the magnetic domains are formed by the magnetic component of the copolymer and the method further comprises subsequently removing the non-magnetic component of the copolymer.7. The method of claim 1 , wherein the alignment features are smaller than the magnetic domains.8. A method comprising:forming a photoresist layer on a disc-shaped rigid substrate having a polymer ...

HARD DISK DRIVE

According to one embodiment, there is provided a hard disk drive including a first recording surface, a second recording surface, a first magnetic head, a first actuator and a second actuator that move the first magnetic head, a second magnetic head, a third actuator and a fourth actuator that move the second magnetic head, a fifth actuator that moves the second actuator and the fourth actuator, a drive circuit that implements at least one of a first mode in which the second actuator and the fourth actuator operate differently from each other or a second mode in which the first and third actuators operate differently from each other, and a controller that controls the drive circuit. 1. A hard disk drive comprising:a first recording surface;a second recording surface;a first magnetic head that performs reading/writing on the first recording surface;a first actuator that moves the first magnetic head;a second actuator that moves the first magnetic head and the first actuator in an integrated manner;a second magnetic head that performs reading/writing on the second recording surface;a third actuator that moves the second magnetic head;a fourth actuator that moves the second magnetic head and the third actuator in an integrated manner;a fifth actuator that moves the second actuator and the fourth actuator in an integrated manner;a drive circuit that implements at least one of a first mode in which the first actuator and the third actuator perform same operation and the second actuator and the fourth actuator perform different operations or a second mode in which the second actuator and the fourth actuator perform same operation and the first actuator and the third actuator perform different operations; anda controller that controls the drive circuit.2. The hard disk drive according to claim 1 , whereinthe drive circuit includes a plurality of switches that switches a switching state to select, from the first actuator, the second actuator, the third actuator, and the ...

MAGNETIC DISC APPARATUS

According to one embodiment, a magnetic disc has N (N is an integer of 2 or more) zones divided in a radial direction, and servo patterns different in servo pattern frequency are recorded in the individual zones. The relationship that the zone width of a K-th (K is an integer of 1 or more and N−1 or less) zone from the outer radial side of the magnetic disc is larger than the zone width of the K+1-th zone adjacent to the K-th zone on the inner diameter side applies to all the K-th zones in which K is 1 or more and N−1 or less. 1. A magnetic disc apparatus comprising:a magnetic disc having N (N is an integer of 2 or more) zones divided in a radial direction; anda magnetic head provided for the magnetic disc, whereinservo patterns different in servo pattern frequency are recorded in the individual zones, andrelationship that a zone width of a K-th (K is an integer of 1 or more and N−1 or less) zone from an outer radial side of the magnetic disc is larger than a zone width of the K+1-th zone adjacent to the K-th zone on an inner diameter side applies to all the K-th zones in which K is 1 or more and N−1 or less.2. The magnetic disc apparatus of claim 1 , wherein claim 1 , when the zone width of the K-th zone is designated as Wod and the zone width of the K+1-th zone is designated as Wid claim 1 , relationship 1.25≥Wod/Wid>1.05 holds.3. The magnetic disc apparatus of claim 1 , wherein claim 1 , when the zone width of the K-th zone is designated as Wod claim 1 , the zone width of the K+1-th zone is designated as Wid claim 1 , an outer radius of the K-th zone is designated as Rod claim 1 , and an inner radius of the K+1-th zone is designated as Rid claim 1 , relationship Wod/Wid=1−0.22 (Rod/Rid−1) holds.4. The magnetic disc apparatus of claim 2 , wherein claim 2 , when the outer radius of the K-th zone is designated as Rod claim 2 , the inner radius of the K+1-th zone is designated as Rid claim 2 , a dividing radius between the K-th zone and the K+1-th zone is designated ...

Disk device and information processing apparatus

According to one embodiment, there is provided a disk device including a head, a disk, a first motor, and a first circuit. The disk has a recording surface. The first motor causes the head to seek along the recording surface. The first circuit can switch between a first state and a second state. The first state is a state where a current path of the first motor is electrically cut off from a first electricity storage unit. The second state is a state where the current path of the first motor is electrically connected to the first electricity storage unit.

WRITE MANAGEMENT OF PHYSICALLY COUPLED STORAGE AREAS

A method for managing data bands within an interlaced magnetic recording (IMR) architecture includes transmitting read/write characteristics of a logical block address space, the read/write characteristics including coupling information characterizing a physical arrangement of data blocks associated with different logical zones in the logical block address space, where each of the logical zones spans a continuous range of logical block addresses mapped to a series of data blocks physically interlaced with another series of data blocks corresponding to another one of the logical zones. The method further provides for executing a write command instructing a data write to a target logical zone of the logical zones, the write command being generated based on the transmitted coupling information. 1. A method comprising:transmitting read/write characteristics of a logical block address space, the read/write characteristics including coupling information characterizing a physical arrangement of data blocks associated with different logical zones in the logical block address space; andexecuting a write command instructing a data write to a target logical zone of the logical zones, the write command generated based on the transmitted coupling information.2. The method of claim 1 , each of the logical zones being mapped to a series of data blocks that is physically coupled to another series of data blocks corresponding to another one of the logical zones.3. The method of claim 1 , wherein the read/write characteristics include a data throughput indicator quantifying a write throughput associated with each one of the different logical zones.4. The method of claim 1 , further comprising:updating a fill state of the target logical zone; andtransmitting the updated fill state of the target logical zone to a host responsive to a query for the read/write characteristics of the logical block address space.5. The method of claim 1 , wherein the logical block address space is ...

Magnetic tape and magnetic tape device

The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which a total thickness of the magnetic tape is equal to or smaller than 5.30 μm, the magnetic layer includes a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, one or more components selected from the group consisting of fatty acid and fatty acid amide are included in the magnetic layer, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %.

MAGNETIC TAPE AND MAGNETIC TAPE DEVICE

The magnetic tape includes a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer, in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes a timing-based servo pattern, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050. 1. A magnetic tape comprising:a non-magnetic support;a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; anda magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer,wherein the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm,the magnetic layer includes a timing-based servo pattern, andlogarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.2. The magnetic tape according to claim 1 ,wherein the logarithmic decrement is 0.010 to 0.050.3. The magnetic tape according to claim 1 ,wherein the logarithmic decrement is 0.010 to 0.040.4. The magnetic tape according to claim 1 ,wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm.5. The magnetic tape according to claim 2 ,wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm.6. The magnetic tape according to claim 3 ,wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm.7. A magnetic tape device comprising:a magnetic tape,a magnetic head; anda servo head, whereinthe magnetic tape is a magnetic tape comprising:a non-magnetic support;a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic ...

MAGNETIC RECORDING MEDIUM AND CARTRIDGE

A tape-type magnetic recording medium, includes a substrate; and a magnetic layer provided on the substrate. The magnetic recording medium is configured such that (1) (w−w)/w≤400 [ppm] where wand ware respectively maximum and minimum of average values of width of the magnetic recording medium measured under four environments whose temperature and relative humidity are (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), respectively, and the magnetic layer has a squareness ratio of 65% or more in the vertical direction, and (2) 4.4≤T/(T−T) where Tis an average thickness of the magnetic recording medium and Tis an average thickness of the substrate.

Parallelized writing of servo rro/zap fields

An apparatus may include a first and second servo channels configured to output first and second position information to first and second writers, respectively, via a shared write path such that the first and second writers write first and second position information to first and second magnetic recording medium surfaces, respectively. In addition, the apparatus may include a controller configured to control the shared write path such that write access is changed between the first servo channel and second servo channel a plurality of times during a revolution of the first magnetic recording medium surface and second magnetic recording medium surface.

MAGNETIC DISK DEVICE AND READ/WRITE PROCESSING METHOD

According to one embodiment, a magnetic disk device includes a disk, a head configured to write data to the disk and read data from the disk, and a controller configured to write position information of the head when writing a first track of the disk and a second track partially overlapping with the first track in a first region of the first track at which read processing on the first track is started. 1. A magnetic disk device comprising:a disk;a head configured to write data to the disk and read data from the disk; anda controller configured to write position information of the head when writing a first track of the disk and a second track partially overlapping with the first track in a first region of the first track at which read processing on the first track is started.2. The magnetic disk device according to claim 1 , wherein the controller overwrites the second track on the first track and writes the position information in the first region.3. The magnetic disk device according to claim 2 , wherein the controller writes the position information to be shifted in an opposite direction from the second track.4. The magnetic disk device according to claim 2 , wherein the controller writes data in a third region of the second track except for a second region of the second track adjacent in a radial direction of the disk in the first region.5. The magnetic disk device according to claim 2 , wherein the controller writes data to be shifted in an opposite direction from the first track in a second region of the second track adjacent in a radial direction of the disk in the first region.6. The magnetic disk device according to claim 2 , wherein the controller controls the head with a second threshold that allows a shift of the head in a direction of the second track claim 2 , the second threshold smaller than a first threshold that allows a shift of the head in an opposite direction from the second track claim 2 , to write data.7. The magnetic disk device according to ...

Master carrier for magnetic transfer and method for transfer

The present invention provides a master carrier for magnetic transfer, comprising a plurality of transfer information recording sectors having recording information magnetized thereon, a non-magnetic-material sector defining each of the transfer information recording sectors is present between each of adjacent transfer information recording sectors, and surfaces of the transfer information recording sectors and surfaces of the non-magnetic material sectors are positioned on and form the same plane.

Servo track writing using extended copying with head offset

The present invention proposes a new servo track writing technique called Extended Copying with Head Offset ('ECHO'). The read and write elements of the read/write head are offset from each other. A servo writer writes a guide pattern on the magnetic media disc. ZAP correction factors are added to the guide pattern. The head disc assembly is then connected to an electrical control system for self-propagating servo writing. The actuator arm is displaced until the read head is aligned over the guide pattern. A new servo track is written by the write element. ZAP correction factors are added to the newly written servo track. The actuator arm is displaced until the read element is aligned with the newly written servo track. A new servo track is written. ZAP correction factors are added to the newly written servo track. The process is repeated until a desired number of servo tracks are written.

Flexible magnetic recording medium

A flexible magnetic recording medium to which data is transferred by being brought into intimate contact with a master carrier which has a land/groove pattern corresponding to the data and also has a surface whose Moh's hardness is 6 to 10. The magnetic recording medium includes a substrate, a non-magnetic layer, and a magnetic layer. The non-magnetic layer and the magnetic layer are coated on the substrate in the recited order. The magnetic layer contains an abrasive comprising diamond particles whose average particle size is 0.03 to 0.5 μm. The diamond particle content of the abrasive is in a range of 0.1 to 5 wt % of ferromagnetic powder contained in the magnetic layer.

자기기록매체와 그 제조방법 및 자기기록장치

서보정보가 써넣어지는 자기 패턴과, 데이타가 써넣어지는 자기기록층을 가지는 자기기록매체는, 비자성기판과, 비자성기판상에 형성된 자기기록층과, 서보신호기록영역에 있어서, 자기기록층에 접속하는 경질자성층을 가지고, 다시금, 트랙길이방향의 막두께의 변화로서 형성된 서보패턴을 가지고 있다.

Improvements in self-servowriting timing pattern generating

자기 서보 기록에 있어서 타이밍 패턴들의 배치에 대한 개선안은 기하학적 영향에 기인하는 랜덤 에러 및 조직적 에러들의 정정을 포함한다. 서로 분리된 판독 소자 및 기록 소자를 갖는 기록 헤드를 구비한 디스크 드라이브에 있어서, 상기 소자들간의 간격을 결정하는 방법과 상기 헤드 및 디스크간의 왜곡 각도의 함수로서 위와 같은 에러들을 정정하는 방법이 제공된다. 액츄에이터상의 헤드 오정렬에 의한 에러뿐 아니라 상기 소자들의 오정렬 및 비평행성에 기인하는 에러들도 검출되고 교정된다. 디스크의 회전 속도 변화에 기인하는 에러 및 인접한 타이밍 패턴들에 대한 타이밍 패턴들의 잘못된 배치에 기인하는 에러들이 검출되고 각 디스크상에 랜덤에러를 기록하고 검출하는데와 후속되는 트랙들상에서 정정될 수 있다. Improvements to the placement of timing patterns in magnetic servo recording include correction of random and organizational errors due to geometric effects. In a disk drive having a recording head having read and write elements separated from each other, a method of determining the spacing between the elements and a method for correcting the above errors as a function of the distortion angle between the head and the disk are provided. . Errors due to misalignment and non-parallelity of the elements as well as errors due to head misalignment on the actuator are detected and corrected. Errors due to variations in the rotational speed of the disc and errors due to incorrect placement of timing patterns relative to adjacent timing patterns can be detected and corrected on the subsequent tracks for recording and detecting a random error on each disc.

Magnetic tape and magnetic tape device

情報転送装置

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

校正磁头在旋转磁盘上写定时码形时的系统误差的方法

本发明提供一种用于校正磁盘驱动器中的磁头在磁盘上写定时码形的方法，包括：用磁头在所述磁盘的第一磁道上的第一位置写第一系列触发码形；记录在一个和磁盘的旋转方位有关的旋转标记与所述第一磁道上的至少一个触发码形之间的时间间隔；从记录的时间间隔与预定的所需时间间隔的偏差计算一个标记校正值；用所述标记校正值改变写在后续磁道上的每个触发码形的位置。

Magnetic tape device and head tracking servo method

Method for flexible BPI and TPI selection in disk drives and hard disk drive using the same

본 발명은 하드 디스크 드라이브의 용량, 인치 당 비트 값과 인치 당 트랙 값들을 가변시켜 결정하기 위한 방법 및 장치에 관한 것이다. 본 발명은 드라이브의 각 헤드에 대한 최적화된 인치 당 트랙 값을 결정하는 방법을 포함한다. 본 발명은 각 헤드가 임계 BER 값을 초과하지 않는지를 판정하여, 하나 이상의 헤드가 임계 BER 값을 초과하지 않으면 허용할 수 있는 BER에 도달될 때까지 실행하지 않는 헤드들의 BPI를 감소시킨다. 실행하는 헤드의 BPI는 디스크 드라이브의 용량이 목표 값에 도달될 때까지 증가시킨다. 같은 방법으로, 만일 모든 헤드들이 위의 임계 값을 초과하면 하나 이상의 실행하는 헤드의 BPI를 헤드들의 BER을 향상시키기 위하여 감소시킨다. BPI에서의 감소는 드라이브가 항상 목표 용량 값에 도달되도록 제한된다. BPI 및 TPI 값들은 드라이브의 동작 중에 이용되기 위하여 메모리에 저장된다. The present invention relates to a method and apparatus for varying and determining the capacity of a hard disk drive, bit values per inch and track values per inch. The present invention includes a method for determining an optimized track value per inch for each head of a drive. The present invention determines whether each head does not exceed the threshold BER value, thereby reducing the BPI of the heads that do not run until one or more heads do not exceed the threshold BER value until an acceptable BER is reached. The running head's BPI increases until the capacity of the disk drive reaches its target value. In the same way, if all the heads exceed the above threshold, the BPI of one or more running heads is reduced to improve the BER of the heads. The decrease in BPI is limited so that the drive always reaches the target capacity value. BPI and TPI values are stored in memory for use during drive operation.

Method and apparatus for forming magnetization pattern of magnetic recording medium, magnetic recording medium and method for manufacturing the same, and magnetic recording apparatus

(과제) 고밀도기록용 매체에 미세한 자화패턴을 효율적으로 형성하는 방법을 제공하여 보다 고밀도의 기록이 가능한 자기기록매체 및 자기기록장치를 단시간에 저렴하게 제공한다. (Problem) Provided is a method for efficiently forming a fine magnetization pattern on a high density recording medium, thereby providing a magnetic recording medium and a magnetic recording apparatus capable of higher density recording in a short time and inexpensively. (해결수단) 자성층을 구비하여 이루어지는 자기기록매체에 대해, 제 1 외부자계를 인가하여 자성층을 소정 방향으로 균일하게 자화시킨 후, 자성층을 국소적으로 가열함과 동시에 제 2 외부자계를 인가하여 가열부를 상기 소정 방향과는 반대방향으로 자화시킴으로써 자화패턴을 형성하는 방법으로서, 제 2 외부자계가 펄스형상의 자계성분을 갖는 자화패턴 형성방법. (Measures) After applying a first external magnetic field to a magnetic recording medium including a magnetic layer to uniformly magnetize the magnetic layer in a predetermined direction, the magnetic layer is locally heated and simultaneously by applying a second external magnetic field. A method of forming a magnetization pattern by magnetizing a part in a direction opposite to the predetermined direction, wherein the second external magnetic field has a pulse-shaped magnetic field component. 자기기록매체, 자화패턴, 외부자계 Magnetic recording medium, magnetization pattern, external magnetic field

Hard disk drive, defect type detection method on disk, and defect detection method

Method and apparatus for servo positioning in a direct access storage device

본 발명의 위상 변조식 서보 방법 및 장치는 디스크 파일에 있는 폭이 좁은 변환기 헤드를 사용함으로써 서보 위치 설정을 위해 수용 가능한 위치 선형성을 제공한다. 디스크 파일은 축을 중심으로 회전하도록 장착된 하나 이상의 디스크를 포함하며 (여기서 디스크는 데이타를 저장하는 하나 이상의 디스크 표면을 가짐), 또 데이타와 서보 패턴을 상기 디스크 표면에 기록하고 상기 디스크 표면으로부터 판독하기 위해 상기 디스크 표면을 가로질러 이동하도록 장착된 하나 이상의 변환기 수단을 구비한다. 변환기는 판독 소자와 기록 소자를 포함한다. 판독 소자는 기록 소자보다 좁은 폭을 가지며, 그 폭은 데이타 실린더폭의 1/3 이상이고 1/2 이하이다. 서보 패턴은 데이타 실린더의 1/2 이하인 트랙폭을 갖도록 데이타 디스크 표면 상에 기록되며, 서보 패턴은 선택된 수 만큼의 데이타 실린더마다 반복된다. The phase modulated servo method and apparatus of the present invention provides acceptable position linearity for servo positioning by using a narrow transducer head in the disk pile. The disk file includes one or more disks mounted to rotate about an axis (where the disks have one or more disk surfaces for storing data), and write data and servo patterns to and read from the disk surfaces. At least one transducer means mounted to move across the disk surface. The converter includes a read element and a write element. The read element has a narrower width than the write element, the width of which is at least 1/3 and less than 1/2 of the data cylinder width. The servo pattern is written on the surface of the data disk to have a track width that is 1/2 or less of the data cylinder, and the servo pattern is repeated for each selected number of data cylinders.

Magnetic recording medium, manufacturing method thereof, and magnetic recording device

서보정보가 써넣어지는 자기 패턴과, 데이타가 써넣어지는 자기기록층을 가지는 자기기록매체는, 비자성기판과, 비자성기판상에 형성된 자기기록층과, 서보신호기록영역에 있어서, 자기기록층에 접촉한 경질자성층을 가지고, 다시금, 트랙길입방향의 막두께의 변화로서 형성된 서보패턴을 가지고 있다.

Servo pattern overwrite prevention circuit due to missing servo address mark detection

1. 청구범위에 기재된 발명이 속한 기술분야 1. TECHNICAL FIELD OF THE INVENTION 콘스턴트-덴시티(constant-density) 기록형태를 이용한 디지털정보의 자기 기록/독출 장치에 관한 것으로, 특히 자기디스크상에 기록된 서보섹터를 정확히 검출하기 위해 검출타이밍을 제어하는 방법에 관한 것이다. The present invention relates to a magnetic recording / reading device of digital information using a constant-density recording form, and more particularly, to a method of controlling detection timing to accurately detect a servo sector recorded on a magnetic disk. 2. 발명이 해결하려고 하는 기술적 과제 2. The technical problem to be solved by the invention SAM검출이 잘못 오인되어 감출될 시 SAM서치 시작신호가 발생되고 각종타이밍 생성이 딜레이되어 발생하기 때문에 라이트신호 역시 딜레이 되어 서보섹터영역이 오버라이트(overwite 이하 오버라이트라 함 )가 발생했던 문제점을 해결한다. When SAM detection is wrongly misdetected and hidden, SAM search start signal is generated and various timings are delayed. Therefore, the light signal is also delayed and the servo sector area is overwritten (overwrite). do. 3. 발명의 해결방법의 요지 3. Summary of Solution to Invention 서보섹터의 SAM검출을 미싱하였을 시 서보섹터내의 버스트구간을 잘못 오인하여 SAM이 검출된 것으로 인지하지 않도록 딜레이/서치 플랙을 제공하여 서보섹터의 오버라이트를 방지하는데 있다. When the SAM detection of the servo sector is missed, a delay / search flag is provided to prevent the servo sector from being overwritten so that the burst section in the servo sector is misunderstood and the SAM is not recognized as detected. 4. 발명의 중요한 용도 4. Important uses of the invention 서보섹터를 검출하기 위한 타이밍을 제어하는 방법 및 자기 디스크 기록장치. A method and a magnetic disk recording apparatus for controlling timing for detecting a servo sector.

Magnetic recording medium and its magnetic recording and reproducing apparatus

본 발명의 목적은 자기기록 매체에 있어서 그 기억용량을 증대시킬 수 있도록 하는데 있다. 자기기록 매체(1)에 있어서, 그 R/W영역(2)과, 독출전용의 리드온리 영역(3)을 설정한다. 리드온리 영역(3)은 한 번 기입이 행해진 후에는 독출에만 사용된다. 기드온리 영역(3)을 설정하는 것으로 트랙밀도를 크게 할 수 있고, 또 갭의 단축이 가능해져 기억용량의 증대가 가능해진다.

Disk recorded with servo pattern and method for recording servo pattern

(57)【要約】 【課題】 ディスクにサーボパターンを記録する場合 に、従来はデータゾーンにのみサーボパターンが記録さ れていたため、磁気ヘッドが非データゾーンに入ると磁 気ヘッドの位置制御が不能になった。 【解決手段】 サーボパターンは、サーボ情報およびＡ バーストとＢバースト信号とから成る。ディスクのデー タゾーン３ではサーボパターンが狭トラックピッチＴｐ にて記録され、非データゾーン１では、サーボパターン が前記トラックピッチＴｐよりも広いトラックピッチＴ ｐ１で記録されている。よってディスク装置の磁気ヘッ ドが非データゾーン１に入ってもトラッキングサーボは 外れない。また非データゾーンではサーボパターンのト ラックピッチＴｐ１が広いため、サーボパターンの記録 時間を短縮できる。

Process Control Method Using Servo Track Writer

가. 청구범위에 기재된 발명이 속한 기술분야 end. The technical field to which the invention described in the claims belongs 디스크 드라이브의 제조 공정 Disk Drive Manufacturing Process 나. 발명이 해결하고자 하는 기술적 과제 I. The technical problem to be solved by the invention 드라이브 일련번호를 디스크면에 기록함으로써 효율적으로 공정관리를 수행하며 생산비용을 절감하기 위한 서보트랙라이터를 이용한 공정 관리 방법을 제공한다. By recording the drive serial number on the disk, it provides efficient process management and provides a process management method using a servo tracker to reduce production costs. 다. 발명의 해결방법의 요지 All. Summary of Solution of the Invention 사용자 데이터가 기록되는 데이터 밴드와 다수개의 보호밴드로 구성되는 디스크를 기록매체로 가지는 하드 디스크 드라이브의 제조공정에 있어서, 서보정보 라이트시 드라이브의 일련번호를 상기 밴드들중 적어도 하나의 밴드내에 기록한후 기록된 이후 드라이브의 일련번호를 독출하여 제조공정상에서 사용한다. In the manufacturing process of a hard disk drive having a data band in which user data is recorded and a disk comprising a plurality of protection bands as a recording medium, the serial number of the drive is written into at least one of the bands when writing servo information. After recording, the serial number of the drive is read and used in the manufacturing process. 라. 발명의 중요한 용도 la. Important uses of the invention 디스크 드라이브의 제조 공정에 중요히 사용될 수 있다. It can be important for the manufacturing process of disk drives.

Method for forming servo pattern of floppy disk

(57)【要約】 （修正有） 【課題】 サーボパターンを２回にわたって書込む際 に、書繋ぎ部分を生じることがないようにしたフロッピ ーディスクのサーボパターン形成方法を提供する。 【解決手段】 フロッピーディスクのトラックピッチＴ ｐより幅広の磁気ヘッドギャップを有する磁気ヘッド５ を用い、フロッピーディスクにサーボパターン１７を書 込むもので、１つのトラック１４を基準にしてサーボパ ターン１７を書込んだ後、磁気ヘッド５を所定距離だけ トラック１４の幅方向に移行させてサーボパターン１７ を書込み、以下同様にして複数のトラック１４を基準に して順次サーボパターン１７を書込む際に、磁気ヘッド ５に供給される書込みデータ１２とイレースデータ１３ の供給タイミングを適宜選定し、前回のサーボパターン １７の書込み時にトラック幅から逸脱したサーボパター ン１７の書込み部分１５ｒ、１６Ａｒ、１６Ｂｒを次回 のサーボパターン１７の書込み時に消去している。

Method and apparatus for fingerprinting magnetic media

A method and apparatus is disclosed for determining the remanent noise in a magnetic medium by DC saturation of a region thereof and measurement of the remaining DC magnetization. A conventional magnetic recording transducer may be used to determine the remanent noise. Upon determination, the remanent noise may then be digitized and recorded on the same magnetic medium to thereby "fingerprint" the magnetic medium. This "fingerprint" may then be later used to verify and authenticate the magnetic medium as being an original. In such manner, any magnetic medium, or any object having an associated magnetic medium, may be "fingerprinted" including credit cards, computer programs, compact discs, videotapes, cassette tapes, etc.

Disk storage device, servo writing device, and track interval determination method

Soft magnetic record medium and production thereof

一种软磁记录介质，是通过密接具有与要转录的信息相对应的凹凸图形的磁转录用主载体来转录所述信息并在基板上按非磁性层与磁性层的顺序涂布而成，其特征在于：形成所述非磁性层的涂布液含有相对含于所述非磁性层的非磁性粉体1～20重量％的润滑剂，并且形成所述磁性层的涂布液含有所述润滑剂的1/4以下量的润滑剂，在进行所述磁转录的环境温度下所述两润滑剂是液体。本发明还涉及其制造方法。

Recording control method in magnetic disk drive

Automatic servo disc-writing method in disc driver

在包括与磁盘相互配合设置的磁头的磁盘驱动器中自伺服写磁盘的方法，包括步骤：在第一磁道上写第一组触发码形；确定读到写的延时；确定标记校正值；确定至少一个随机误差校正值；计算一组是读到写延时、标记校正值和至少一个随机误差校正值的函数的延迟值；从第一组触发码形进行触发并用延迟值在一后续磁道上写第二组触发码形。

Method of writing a reference servo signal of hard disk drive and apparatus suitable therefor

一种写入硬盘驱动器的参考伺服信号的方法，该硬盘驱动器具有在写入最终伺服信号时被参照的螺旋参考伺服信号，同时，在预定时间内，磁头以目标移动速度移动通过盘，在螺旋参考伺服信号被写入的预定时间中，由移动磁头的音圈马达产生的反电动势来检测磁头的实际移动速度，并且，通过反馈检测到的实际移动速度，磁头被控制为维持目标移动速度。

Servo Information Structure and Sector Number Counting Method for Expansion of Data Section

1. 청구범위에 기재된 발명이 속한 기술분야 하드 디스크 드라이브의 데이타영역 확장을 위한 서보정보 구성방법 및 그에 따른 섹터넘버 카운팅방법에 관한 것이다. 2. 발명이 해결하려고 하는 기술적 과제 헤더리스 서보기록패턴으로 채용하는 하드 디스크 드라이브에 있어서 서보구간내 섹터넙머를 제거함으로서 데이타 구간을 확장시킬 수 있는 서보정보 구성방법 및 그에 따른 섹터너버 카운팅방법을 제공함에 있다. 3. 발명의 해결방법의 요지 복수개의 서보텍터들을 일군의 서보섹터군으로 구획하고, 구획된 각 서보섹터군의 첫 섹터넘버정보가 인멕스구간에 기록되어 있는 디스크를 기록매체로 사용하는 하드 디스크 드라이브의 섹터넘버 카운팅방법에 있어서, 서보 인터럽트 발생시마다 상기 인덱스구간에 기록되어 있는 인덱스비트 검출유무를 검사하는 과정과, 상기 검사결과 인덱스비트가 검출되는 경우 이에 응답하여 인덱스 타이머를 스타트시킨후 상기 인덱스비트에 대응하는 서보섹터군의 첫 섹터넘버를 기준으로 상기 인덱스 타이머의 카운팅값에 따라 섹터넘버를 카운팅해 가는 과정으로 이루어짐을 특징으로 한다. 4. 발명의 중요한 용도 하드 디스크 드라이브의 서보정보 구성 및 섹터넘버 카운팅방법에 사용될 수 있다.

Data-storage disk having few or no spin-up wedges and method for writing servo wedges onto the disk

A data-storage disk includes a disk sector for storing data and a servo wedge located at the beginning of the sector. The servo wedge indentifies the sector in conjunction with both an initial positioning of a read-write head and a data read or write operation. By using a servo wedge to provide both an initial head position on disk spin up and a head position during a read or write operation, one can increase a disk's data-storage capacity by reducing the number of, or altogether eliminating, spin-up wedges.

Disk file or tape drive with high servo sample rate

A method and means is described for writing data on a recording medium, such as a disk or tape, containing servo samples in such manner that the number of servo samples is increased with a minimal increase in overhead (non-data) regions. The tracks on the medium are divided into a plurality of maxi sections, each of which contains all fields with servo and associated overhead information and also a data field. At least one micro servo section containing only a portion of said information is located within each data field. As each micro servo section passes by an associated recording head, writing and reading of data is temporarily interrupted, but resumed when the micro servo section moves beyond the head, in such manner as to require minimal resynchronization of said data during reading. Using a phase continuous clock, data is written in both portions of a data field to either side of each micro servo section in one pass of the disk or tape relative to the head. The micro servo sections contain no timing reference address mark and require no data encoder/decoder flush or synchronization byte to resume reading in the portion of the data field following each micro servo section.

Locating index mark in rotating storage media

A rotating storage medium (120) has an index mark-indicating sequence recorded thereon, the index mark-indicating sequence comprised of bits distributed over plural servo wedges (22). The index mark-indicating sequence is comprised of a least one bit in each of a specified number of plural servo wedges (22) per track, the specified number forming a subset of the servo wedges (22) of the rotating storage medium (120).

Method for compensating servo offset

PURPOSE: A method for compensating servo offset is provided to compensate offset of hardware components associated with servo control of a hard disc drive so as to improve the performance of servo control. CONSTITUTION: A bias force of each of designated sample tracks is measured(46). A difference between the bias force measured from each sample track and a standard bias force is calculated to obtain the average bias force value of the overall sample tracks(48,50). Whenever servo control is carried out, a servo control signal from which the average bias force value is removed is output to compensate servo offset. The standard bias force is the bias force value when an offset component is zero, and the standard bias force is stored in a bias force table of a hard disc drive. The step of measuring the bias force and the step of calculating the average bias force value are performed before a drive ready mode.

Substrate alignment detection using circumferentially extending timing pattern

Apparatus and method for aligning a rotatable substrate to a support mechanism to write a feature to the substrate, and a substrate so configured. In some embodiments, the substrate has a circumferentially extending timing pattern with spaced apart first and second timing marks disposed on opposing sides of a center point of the timing pattern and an identification (ID) field that stores a unique identifier value associated with the substrate. Upon mounting of the substrate to a support mechanism that rotates the substrate about a central axis that is offset from the center point, a control circuit generates a compensation value to compensate for the offset using the first and second timing marks and outputs a process instruction to authorize processing of the substrate using the unique identifier value. In some cases, the unique identifier value is used as a lookup to a computerized database.

Combination magnetic transducer head apparatus

내용 없음. No content.

Exposure dose control of rotating electron beam recorder

In a beam lithography operation the relative motion between a work piece and the exposure beam produces variations in linear speed at different regions of the work piece surface. For example, if a disk work piece rotates with a constant angular velocity (CAV) relative to the beam, the linear surface speed relative to the beam impact point increases in proportion to increasing radial distance of that point from the center of the disk. To provide uniform exposure dose, the duty cycle of pulses of the exposure beam are varied in accord with radial distance.

Method for forming servo pattern on floppy disk

Dual mode servo pattern

A servo pattern is described that facilitates high resolution and wide dynamic range to accurately pinpoint servo track centerlines on a magnetic tape. The servo pattern provides both absolute positioning information over an entire servo band and absolute positioning information relative to the centerline of each servo track included in the servo band. Therefore, the servo pattern includes implicit servo track identification in a single servo band, eliminating the need for conventional track identification marks. In other words, the servo pattern, itself, can distinguish one servo track from another servo track in the single servo band as well as provide highly accurate positioning information relative to each of the servo track centerlines.

Compound phase encoding for printed servo patterns

A type of servo pattern suitable for tracking systems in magnetic recording devices such as floppy disks or linear tape or hard disks or in other machines. The pattern comprises several phase-encoded elements that provide an absolute transverse position coordinate from local data. Computations can be made with channel chips commonly used in magnetic recording disk drives.

Servo pattern writing method

Methods for selective multi-pass servowriting and self-servowriting

The amount of position error written into a servo burst pattern can be reduced by using additional media revolutions to write the pattern. Where the edges of two servo bursts are used to define a position on the media, trimming the first burst and writing the second burst on separate revolutions will result in a different amount of position error being written into each burst. The end result will be a reduction in the overall error in position information. In order to further reduce the position error given by a burst pair, each burst also can be trimmed and/or written in multiple passes. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

Patent FR2299694B1

Positioning device

INFORMATION WRITING MODE ON A MAGNETIC RECORDING MEDIUM

Mode d'écriture sur un support d'enregistrement magnétique (DISC) où les informations sont réparties sur une pluralité N de pistes, chaque piste étant associée à au moins une zone de référence (ZRPi j ) comprenant des informations de préambule, d'adresse absolue et de position fine. Selon l'invention, le mode d'écriture est caractérisé en ce que la zone de référence comprend une première partie (GCPi j ) constituée des informations de préambule et d'adresse et une seconde partie (GDPi j ) constituée des informations de position fine, la première partie étant disposée et centrée sur la piste de numéro d'ordre j, alors que la seconde partie est décalée d'une demi-piste par rapport au milieu de celui-ci d'un même côté de celui-ci. Applicable aux mémoires à disques magnétooptiques. Writing mode on a magnetic recording medium (DISC) where the information is distributed over a plurality N of tracks, each track being associated with at least one reference zone (ZRPi j) comprising preamble, address information absolute and fine position. According to the invention, the writing mode is characterized in that the reference area comprises a first part (GCPi j) consisting of preamble and address information and a second part (GDPi j) consisting of fine position information , the first part being arranged and centered on the track of order number j, while the second part is offset by half a track with respect to the middle of the latter on the same side of the latter. Applicable to magneto-optical disc memories.

Radial self-propagation pattern generation for disk file servowriting

During a write revolution of a storage medium, a transition is written on the storage medium while servoing on another transition previously recorded on the storage medium. During that write revolution, a position error signal corresponding to the position error of the transducer relative to the previously recorded transition is determined. That position error signal is then stored, during the write revolution, to be used in computing a reference track value associated with the transition being written to correct for the position error. Additionally, a product servo-pattern is written, which includes an embodying of the position error therein.

Magnetic disk

본 발명은 목적은, 시크동작시에 있어서의 등시간간격성을 유지하는데 있다. 그 구성을 보면, 자기디스크(1)의 서보영역(2)을 자기헤드(13)의 시크동작시에 있어서의 이동궤적(21)에 따라서 형성한다. 서보영역(2)에는 서보마크를 트랙에 따른 곡선과 궤적(21)에 따른 곡선으로 형성한다.

Patent FR2202624A5

Disk holder for off-line servo-track writer

오프-라인 서보-트랙 기록장치의 디스크 홀더가 개시된다. 개시된 디스크 홀더는, 다수의 정보 저장용 디스크가 조립한 상태로 오프-라인 서보-트랙 기록장치의 구동 모터에 장착된다. 디스크 홀더는 다수의 디스크를 지지하는 플랜지를 가지고 있으며, 이 플랜지의 일측에는 구동 모터에 장착되는 마운팅부가 마련되고, 플랜지의 타측에는 허브가 마련된다. 허브의 내부에는 공기가 유입되는 공간이 형성되고 있으며 그 외주에는 다수의 디스크와 다수의 스페이서가 조립된다. 허브에는 복수의 가압 부재가 출몰 가능하도록 설치된다. 복수의 가압 부재는 허브 내부로 유입된 공기의 압력에 의해 허브의 외주면 밖으로 돌출되어 다수의 디스크와 다수의 스페이서의 내주면에 가압 밀착된다. 허브의 단부에는 다수의 디스크와 다수의 스페이서를 고정시키는 클램프가 결합된다. 이와 같은 구성에 의하면, 디스크 홀더의 허브에 마련된 복수의 가압 부재에 의해 허브 외주에 조립되는 다수의 디스크의 편심이 방지된다. Disc holder of an off-line servo-track recording apparatus is disclosed. The disclosed disc holder is mounted to a drive motor of an off-line servo-track recording apparatus in a state in which a plurality of information storage discs are assembled. The disk holder has a flange for supporting a plurality of disks, one side of which is provided with a mounting portion mounted to the drive motor, the other side of the flange is provided with a hub. A space in which air is introduced is formed in the hub, and a plurality of disks and a plurality of spacers are assembled on the outer circumference thereof. The hub is provided so that a plurality of pressing members can be sunk. The plurality of pressing members protrude out of the outer circumferential surface of the hub by the pressure of air introduced into the hub, and are in close contact with the inner circumferential surfaces of the plurality of disks and the plurality of spacers. At the end of the hub is coupled a clamp that secures the plurality of disks and the plurality of spacers. According to such a structure, the eccentricity of many disks assembled in the hub outer periphery is prevented by the some press member provided in the hub of the disk holder.

MAGNETIC DISC MEMORIZATION METHOD AND DEVICE

L'invention concerne un procédé et un appareil de mémorisation sur disque magnétique. Des signaux de référence sont enregistrés sur une piste et la tête de lecture-écriture est amenée sur la piste de référence pendant que le disque tourne. La position de la tête par rapport à l'axe de rotation est échantillonnée. Les erreurs de position de signaux de référence, dues à l'excentricité de la piste sont memorisées et sont utilisées ultérieurement pour modifier la position de la tête de manière qu'elle suive une piste qui se trouve dans une relation d'écartement prédéterminée par rapport à la piste de référence. L'invention s'applique notamment à l'enregistrement et à la lecture des données sur disque magnétique. A method and apparatus for magnetic disk storage is provided. Reference signals are recorded on a track and the read-write head is brought to the reference track as the disk spins. The position of the head relative to the axis of rotation is sampled. Reference signal position errors, due to the eccentricity of the track are memorized and are subsequently used to change the position of the head so that it follows a track which is in a predetermined spacing relationship to the head. to the reference track. The invention applies in particular to the recording and reading of data on a magnetic disk.

Positioning system for memory

Reducing written-in errors in servo patterns

A method for writing servo onto a disk of a hard disk drive. The method includes writing a plurality of spiral servo signals with a head. The spiral servo signals are used to generate position error signals and write a plurality of servo patterns. A write current of the head is varied for at least one servo pattern. A PES/WC relationship between the position error signals and the write current is determined and a plurality of final servo patterns are written by utilizing the PES/WC relationship and varying the write current. Varying the write current changes the trailing edge of the servo bits and controls the position of the track center. The PES/WC relationship allows the system to compensate for excursions within a single revolution of the disk.

Magnetic disk apparatus and method for monitoring high-frequency oscillation components

A magnetic disk apparatus includes a magnetic disk with normal and double servo sectors arranged alternately. If a servo interruption period corresponding to adjacent first servo sectors is a first servo interruption period, then a second servo interruption period that is a servo interruption period corresponding to adjacent first servo sector and second servo sector is equal to or less than half of the first servo interruption period.

Data storage device

Method and apparatus for writing a clock track on a storage medium

A method and apparatus for writing clock data to a storage medium, such as a disk, is disclosed. The storage medium has tracks on which data are stored. Clock data is written to a present track on the storage medium. The written clock data is read from said present track. Clock data for a subsequent track on the storage medium is generated from the clock data read from said present track. The phase of the generated clock data for the subsequent track is compared with a reference timing signal and the phase of the generated clock data for the subsequent track is adjusted in accordance with said comparison. Said phase adjusted clock data for the subsequent track is written to said subsequent track. Phase errors can be significantly reduced and, for practical purposes, substantially eliminated. It is not necessary to provide a dedicated clock read/write head.

Data recording medium with servo pattern having pseudo-noise sequences

A data recording medium has tracks with pseudo-noise (PN) sequences with good autocorrelation properties as servo information for controlling the position of the recording head. A first set of alternating tracks uses a leading pseudo-random binary sequence (PRBS), which is a PN sequence with good autocorrelation properties, and a following PRBS that is cyclically shifted from the leading PRBS. A second set of alternating tracks interleaved with the first set also has a leading PRBS and a following PRBS that is cyclically shifted from the leading PRBS, but the leading PRBS in each of the tracks in the second set is offset along-the-track from the leading PRBS in the tracks of the first set. The head positioning control system uses the leading PRBS to generate a servo timing mark (STM), the cyclic shift to generate track identification (TID), and the following PRBS from adjacent tracks to generate the head position error signal (PES).

Disk storage apparatus

Method of writing a reference servo signal of hard disk drive and apparatus suitable therefor

In a method of writing a reference servo signal of a hard disk drive having a spiral reference servo signal that is referred to when writing a final servo signal is written while a head is moved across a disk for a predetermined time at a target movement velocity, an actual movement velocity of the head is detected from a counter electromotive force generated in a voice coil motor that moves that head, for the predetermined time during which the spiral reference servo signal is written, and the head is controlled to maintain the target movement velocity by feeding back the detected actual movement velocity.

Method and apparatus for pre-recording tracking information on magnetic media

METHOD AND APPARATUS FOR PRE-RECORDING TRACKING INFORMATION ON MAGNETIC MEDIA ABSTRACT OF THE DISCLOSURE A method and apparatus for initializing a data-recording media, particularly tape, by use of the same type of media drive used for data-recording purposes, in which the actual edge of the recordable field on the media is first located by a test read/write process and the media is then transported in a succession of passes across the transducing head, during each of which the head is periodically and selectively energized to write mutually-spaced marker bursts and servo-positioning bursts, with the transducing head being moved open-loop a distance corresponding to a half-track width between each media transport. During the first such pass, the marker bursts and servo-positioning bursts are located on the basis of tape travel distance, and on successive passes burst location is determined by sensing the previouslv-recorded marker and servo bursts and timing-out a predetermined distance therefrom by use of an internal clock. In the case of tape-form media, tape transport and transducer-positioning is carried out in a serpentine pattern.

Magnetic recording medium and magnetic recording/reproducing apparatus for the same

Circuit and method for detecting a spin-up wedge and a corresponding servo wedge on spin up of a data-storage disk

A servo circuit includes a servo channel and a processor. The servo channel recovers servo data from servo wedges that identify respective data sectors on a data-storage disk. On spin up of the disk, the processor detects a spin-up wedge associated with one of the servo wedges and then detects the servo wedge. Once the servo wedge is detected, a head-position circuit can read the location data from the servo wedge to determine an initial position of the read-write head. By detecting a both a spin-up wedge and a servo wedge to determine an initial head position on disk spin up, such a servo circuit often allows one to increase the disk's storage capacity by reducing the lengths of the spin-up wedges.

Servo track recorder disk holder

Magnetic duplicating method and magnetic record media

在从属介质的两个面上,利用磁复制可复制出品位高的复制图案。磁复制方法是,在将磁复制用主载体和从属介质紧密接触,施加复制用磁场,对磁记录介质每个单面进行磁复制的方法中,向从属介质的在先磁复制面进行磁复制中使用的磁复制用主载体磁性层的饱和磁化(Ms1)和膜厚(δ1)之积(Ms1δ1),与从属介质的在后复制面进行复制使用的主载体磁性层的饱和磁化(Mδ2)和膜厚(δ2)之积(Ms2δ2)存在1.5<(Ms2δ2)/(Ms1δ1)<10的关系,向在先磁复制面的复制磁场(Hdu1)和在后复制介质面的复制磁场(Hdu2)存在0.2≤Hdu2/Hdu1≤0.9的关系。

Video recording and reproducing apparatus having variable reproduction speeds

Abstract of the Disclosure A video recording and reproducing apparatus utilizes a specialized head assembly which is arranged to be driven in a radial direction relative to a rotating magnetic recording disc. A spiral track is recorded on the disc and the specialized head assembly employs two discrete indi-vidual heads which are proximately aligned. The signals produced by each head are utilized in producing the final output signal. During playback, "scene motion speed" depends upon the speed at which the bead is moved in a radial direc-tion relative to the recorded disc and on the manner in which the output signals from the two heads are operated on.

Photo servo patterning on magneto-optical media

A magnetic field patterning system which consists of a magnetic field assembly (506) for exposing at least a region of a magnetic disc (504) to a magnetic field (507), a mask (501) aligned with the region comprising a pattern representing servo information, a light source (502) aligned with the mask (501) for exposing the disc (504) to the pattern on the mask (501) and for heating the region of the disc above its compensation temperature so that the image on the mask (501) is transferred to the disc (504).

Method of writing a reference servo signal of hard disk drive and apparatus suitable therefor

一种写入硬盘驱动器的参考伺服信号的方法，该硬盘驱动器具有在写入最终伺服信号时被参照的螺旋参考伺服信号，同时，在预定时间内，磁头以目标移动速度移动通过盘，在螺旋参考伺服信号被写入的预定时间中，由移动磁头的音圈马达产生的反电动势来检测磁头的实际移动速度，并且，通过反馈检测到的实际移动速度，磁头被控制为维持目标移动速度。

Servo writing a disk drive by writing spiral tracks using a mechanical position sensor

A disk drive is disclosed including a disk, an actuator arm, a head attached to a distal end of the actuator arm, a mechanical position sensor operable to generate a position signal representing a position of the head relative to the disk, and a voice coil motor for rotating the actuator arm about a pivot. The disk is rotated at a predetermined velocity, a control signal is generated in response to the position signal generated by the mechanical position sensor, and the control signal is applied to the voice coil motor in order to seek the head radially over the disk while writing a spiral track to the disk. The spiral track is then processed to maintain the head along a servo track while writing product servo sectors along the servo track.

Patterned-media magnetic recording disk and disk drive with data zones having nondata regions near the zone boundaries

A patterned-media magnetic recording disk has data islands arranged into concentric data tracks and the data tracks arranged into radially-spaced annular zones, with each zone having an inside-diameter (ID) perimeter and an outside-diameter (OD) perimeter and at least one annular nondata region near one of its perimeters. Each zone includes generally radially-directed synchronization (sync) marks that extend from the zone ID perimeter to the zone OD perimeter so as to extend into the annular nondata region or regions of the zone. In the disk drive that uses the patterned-media disks the read head and write head have an effective radial offset relative to one another, so the write head may be on a data track near a zone perimeter when the read head is located in a nondata region. The read head detects the sync marks that extend into the nondata region so that the write head can be synchronized with the data islands in the data track.

Vertically-oriented servo track writer and method

A vertically-oriented servo track writer assembly and method for recording servo pattern on a disc surface includes a spindle hub assembly that rotates one or more discs in a substantially vertical plane and an actuator assembly that pivots an E-block about a substantially horizontal axis. The E-block includes one or more actuator arms and associated flexures, with each flexure including a servo recording head. Pivoting motion of the E-block moves each servo recording head in a substantially vertical plane adjacent a surface of an associated disc to record servo pattern information on the disc surface. The method further includes laterally moving the actuator assembly into and out of engagement with the spindle hub assembly to simplify loading and unloading discs from the spindle hub assembly.

Disk drive support assembly, clamp assembly and disk drive carrier

A disk drive support assembly has a clamp arrangement for releasably clamping a disk drive to a massive block. The clamp arrangement may be an inflatable actuator that is operable to clamp the disk drive to the block via a disk drive carrier. Various clamp assemblies for clamping a disk drive to a substrate, such as a disk drive carrier, are also disclosed. A disk drive carrier that can be adapted for use with different types of disk drive is also disclosed. Such disk drives include those that provide for electrical and/or data connections under the disk drive, those that provide for electrical and/or data connections at the rear of the disk drive, and those that have their own so-called product card associated therewith.

Method of and apparatus for defining disk tracks in magnetic recording media

A method of, and apparatus for, defining disk tracks in magnetic recording media. The track-writing apparatus ( 20 ) is capable of forming tracks ( 340 ) with a track width (TW) and track spaces ( 350 ) with a space width (SW) on a magnetic media disk ( 70 ) having an upper surface ( 70 S), wherein the disk comprises a magnetic medium with a thermal diffusion length (X). The apparatus comprises, in order along an optical axis (A 1 ), a laser light source ( 30 ) capable of providing a pulsed laser light beam (B 1 ), a light pipe ( 32 ), and illumination shaping optical system ( 40 ) that provides substantially uniform illumination over an exposure region (ER), and a phase plate ( 60 ) having a phase grating ( 210 ) with a grating period (p), arranged proximate and substantially parallel to the upper surface of the disk so as to form an periodic irradiance distribution ( 380 ) at the surface of the disk when the phase plate is illuminated with the exposure region. The irradiance distribution is capable of heating one or more regions of the disk to beyond the Curie temperature of the magnetic media. A method of defining the disk tracks using Spatial Period Division (SPD) with the track writing apparatus described above by forming closed annular demagnetized spaces in a periodic magnetized pattern ( 300 ) formed in the disk is also disclosed.

Head position control method of disk device and disk device

Method and apparatus for partial self-servo writing using servo wedge propagation

A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information is grouped into a 1× set of servo information and a 2× set of servo information. The disk drive's read head is used to read the 1× set of servo information in order to position the disk drive's write head to write servo information which is radially-aligned with the 2× set of servo information. Then, the disk drive's read head is used to read the 2× set of servo information in order to position the disk drive's write head to write servo information which is radially-aligned with the 1× set of servo information. The process is repeated on a track-by-track basis until servo information is written from the outer diameter of the disk surface to the inner diameter of the disk surface, as if it was entirely written by a servo track writer.

Track address pattern of magnetic disk drive

Servo write head and method of writing magnetic servo information

A servo writing transducer is shown having transverse side surfaces (33, 34) of the pole pieces (7) adjoining the gap formed to optimize compression of the fringe field at one transverse side (33) to reduce the dead band intermediate servo tracks. The existence of a wider fringe field region at the opposite transverse side (34) is without consequence since the servo writing procedure is to first write the farthest track at the transducer side at which the compressed field occurs followed by each succeeding, adjoining servo track causing the information written in the wide fringe field to be overwritten by the next track.

Media Pre-Write With Track-Aligned Write Beam Deflection and Write Frequency Adjustment

Method and apparatus for formatting a data storage medium, such as a magnetic or optical disc. In accordance with various embodiments, a data storage medium is rotated while a write beam is used to write data to the rotating medium. The data are written in the form of a plurality of concentric data tracks. A deflection angle of the write beam is continuously adjusted in an axial direction along each track. In some embodiments, the axial deflection of the write beam imparts a desired angular offset between a beginning point of a first track and a beginning point of an immediately adjacent second track. This allows a first translation geometry, such as a linear translation path of a linear actuator, to emulate a different second translation geometry, such as a rotary translation path of a rotary actuator.

Method and apparatus for writing clock data to a storage medium

(57)【要約】 記憶媒体が回転している間に、クロック・データを記憶媒体に書き込む方法において、クロック・データのバーストが現行トラックから読み取られる。後続のトラックのためのクロック・データのバーストが記憶媒体上で、現行トラックから読み取られたクロック・データのバーストに従って生成され、その位相が調整される。位相調整されたクロック・データのバーストが後続のトラックに書き込まれる。これらのステップが複数のクロック・データのバーストについて、記憶媒体の回転中に繰り返され、それによりクロック・データが後続のトラックに書き込まれる。

Certifying while servowriting media

Certifying a media while servowriting the media by formatting a full compliment of servo data in storage tracks of the media in a minimum number of passes per storage track while simultaneously performing a 100% media certification of the storage tracks during the minimum number of passes per storage track.

Device for adjusting a magnetic head