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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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05-01-2012 дата публикации

Equalizer and equalization method

Номер: US20120002712A1

Автор: Atsushi Hayami, Makoto Itonaga

Принадлежит: Victor Company of Japan Ltd

A linear equalizer unit sequentially subjects a signal to be processed to linear equalization. A temporary decision unit sequentially subjects a signal subjected to linear equalization by the linear equalizer unit to temporary decision. A nonlinear equalizer unit derives a plurality of coefficients using a signal subjected to temporary decision as a teacher signal and sequentially subject a signal subjected to linear equalization by the linear equalizer unit to nonlinear equalization based on the plurality of coefficients.

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Номер записи: 1

19-01-2012 дата публикации

Disk drive with variable incremented counting of writes to the data tracks for minimizing the effect of far track erasure

Номер: US20120014013A1

Автор: Bruce Alexander Wilson, Marco Sanvido, Zvonimir Z. Bandic

Принадлежит: Hitachi Global Storage Technologies Netherlands BV

A hard disk drive (HDD) minimizes the effects of far track erasure (FTE) by counting the number of writes to the data tracks and incrementing counters based on the known effect of FTE on each track. The extent of the FTE effect is determined for each track within a range of tracks of the track being written, and based on the relative FTE effect for all the tracks in the range a count increment (CI) is determined for each track within the range. A counter is maintained for each track. For every writing to a track, a count for each track within a range of the track being written is increased by the CI value associated with the track number within the range. When the count value for a track reaches a predetermined threshold the data is read from that track and rewritten, preferably to the same track.

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Номер записи: 2

09-02-2012 дата публикации

Low viscosity electrostatic discharge (esd) dissipating adhesive

Номер: US20120033332A1

Автор: Dylan J. Boday, Icko E. T. Iben, Wayne A. McKinley, William T. Bandy, IV

Принадлежит: International Business Machines Corp

In one embodiment, a system includes a cable comprising a plurality of leads and an ESD dissipating adhesive coupled to the plurality of leads in a coverage area for providing ESD protection to an element of an electronic device. The ESD adhesive comprises a mixture of a polymeric thin film and electrically conductive fillers dispersed in the film, and the ESD adhesive has a resistivity from about 50 to 100 MΩ. In another embodiment, a method for providing ESD protection to an element of an electronic device includes applying an ESD adhesive across exposed leads of a cable and evaporating the solvent from the ESD adhesive. At least some of the leads are coupled to an element of an electronic device. The ESD adhesive comprises a polymeric thin film, electrically conductive fillers dispersed in the polymeric thin film, and a solvent for controlling a viscosity of the ESD adhesive.

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Номер записи: 3

09-02-2012 дата публикации

Systems and Methods for Sequence Detection in Data Processing

Номер: US20120036173A1

Автор: Viswanath Annampedu

Принадлежит: LSI Corp

Various embodiments of the present invention provide systems and methods for sequence detection. As an example, a method for data detection is disclosed that includes: receiving a series of data samples at a detector circuit; multiplying a portion of the series of data samples by a first correlator value corresponding to a first binary transition to yield a first value; multiplying the portion of the series of data samples by a second correlator value corresponding to a second binary transition to yield a second value; adding the first value to a prior state value to yield a first interim value; adding the second value to the prior state value to yield a second interim value; and selecting the larger of the first interim value and the second interim value to yield a surviving interim value.

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Номер записи: 4

22-03-2012 дата публикации

Magnetic media formed by a thin planar arbitrary gap pattern magnetic head

Номер: US20120069473A1

Автор: Matthew P. Dugas

Принадлежит: Advanced Research Corp

Magnetic media made using planar magnetic heads. A head may comprise a substrate having conductive thru-hole vias extending therethrough, a first magnetic layer deposited and patterned on the substrate, a first insulation layer deposited and patterned on the first magnetic layer, a conductive coil layer deposited and patterned on the first insulation layer and connected to the conductive thru-hole vias, a second insulation layer deposited and patterned on the conductive coil layer, vias patterned into the insulation layer extending to the first magnetic layer, a second magnetic layer deposited in the vias, and a third magnetic layer deposited and patterned on the second insulation layer and second magnetic layer. The third magnetic layer may be connected to the first magnetic layer through the second magnetic layer deposited in the vias of the insulation layers.

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Номер записи: 5

12-04-2012 дата публикации

Piezoelectric actuator and head suspension

Номер: US20120087047A1

Автор: Shogo Imuta

Принадлежит: NHK Spring Co Ltd

A piezoelectric actuator includes an actuator base that supports a load beam and has an opening accommodating a piezoelectric element, a receiver member that is laid on and fixed to the actuator base and forms a receiver that faces the opening and receives the piezoelectric element, an adhesive part formed of a liquid adhesive that is filled in a space defined by the piezoelectric element, an inner circumference of the opening, and the receiver and adheres the piezoelectric element to the inner circumference of the opening and the receiver, and a suppressing zone that is formed along an overlapping area where the actuator base and receiver member overlap each other and suppresses penetration of the liquid adhesive due to a capillary phenomenon into the overlapping area.

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Номер записи: 6

24-05-2012 дата публикации

Gain control with multiple integrators

Номер: US20120126876A1

Автор: Jacob Lee Dahle, Larry Leeroy Tretter, Robert Allen Hutchins, Sedat Oelcer

Принадлежит: International Business Machines Corp

A method according to one embodiment includes receiving an increment signal at a first integrator when a second integrator overflows; receiving a decrement signal at the first integrator when the second integrator underflows; and incrementing or decrementing a gain applied to an analog signal based on receipt of the increment or decrement signal. A system according to one embodiment includes a first integrator configured to cause incrementing of a gain applied to an analog signal based on receipt of an increment signal when a second integrator overflows, the first integrator being configured to cause decrementing of the gain applied to the analog signal based on receipt of a decrement signal when the second integrator underflows; and the second integrator.

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Номер записи: 7

28-06-2012 дата публикации

Magnetic disk drive and method of accessing a disk in the drive

Номер: US20120162809A1

Автор: Ikuko Iida

Принадлежит: Toshiba Corp

According to one embodiment, a magnetic disk drive includes a disk, a determination module, and a controller. The determination module is configured to determine whether access to the disk requires data transfer between a host and the magnetic disk drive in accessing the disk. The controller is configured to control disk access according to a predetermined allocation of consecutive second logical addresses corresponding to physical addresses indicative of consecutive physical locations on the disk if the data transfer is not required. The second logical addresses are addresses different from first logical addresses recognized by the host.

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Номер записи: 8

28-06-2012 дата публикации

Interleaved conductor structure with wrap around traces

Номер: US20120162825A1

Автор: Edgar D. Rothenberg, John T. Contreras, Nobumasa Nishiyama, Rehan A. Zakai, Yiduo Zhang

Принадлежит: Hitachi Global Storage Technologies Netherlands BV

An interleaved conductor structure for electrically connecting the read/write electronics to a read/write head in a hard disk drive is provided. The interleaved conductor structure may allow for an increased characteristic-impedance range, greater interference shielding and a reduction of signal loss that is contributed by a lossy conductive substrate. The electrical traces may have different widths, be offset, or even wrap around each other at the via connections.

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Номер записи: 9

12-07-2012 дата публикации

Magnetic reading and writing device

Номер: US20120176699A1

Автор: Takashi Hayashi

Принадлежит: Fuji Electric Co Ltd

In a magnetic reading/writing device, a controller derives at each radius of a recording medium a slope of a curve of track-averaged write performance with respect to an adjustment parameter, and determines a first set of fitting coefficients of a first equation approximating the derived slopes in terms of a first variable representing each radius. The controller acquires write performance dependence on a variable representing each of multiple circumferential positions of the medium by measuring track average write performance with respect to the circumferential positions, and determines a second set of fitting coefficients to approximate by a periodic function the acquired dependence in terms of the first variable. The controller corrects a condition value representing the adjustment parameter by subtracting from the condition value an adjustment value obtained from functions calculated with the first and second sets of fitting coefficients.

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Номер записи: 10

02-08-2012 дата публикации

Information recording device and information recording method

Номер: US20120194946A1

Автор: Hideaki Tanaka, Hikaru Watanabe, Tatsuya Haga

Принадлежит: Toshiba Corp

According to one embodiment, an information recording device includes: a recording controller configured to control recording of information on a magnetic recording medium having tracks by a recording method; a managing module configured to manage two or more counters corresponding to each of plural track groups that are adjacent to each other; an updating module configured to update a count of one of the two or more counters corresponding to a second track group that is adjacent to a first track group of the plural track groups when information has been recorded on the first track group; a determining module configured to determine an attribute of the second track group based on the updated count of the one counter; and a rewriting module configured to rewrite information recorded in the second track group based on the determined attribute.

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Номер записи: 11

30-08-2012 дата публикации

Signal reception apparatus and signal reception method

Номер: US20120219049A1

Автор: Keigo SOGABE

Принадлежит: Toshiba Corp

One embodiment provides a signal reception apparatus including: a reception module configured to receive a signal; a storing module configured to store information regarding a characteristic of the received signal; a determination module configured to read out the stored information and to determine a parameter value corresponding to the read-out information; a discrimination module configured to discriminate a noise contained in the signal, based on the signal and the determined parameter value; and an identification module configured to identify the noise contained in the signal, based on a discrimination result by the discrimination module.

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Номер записи: 12

30-08-2012 дата публикации

Apparatus and method for reading data from a tape

Номер: US20120221786A1

Автор: Shinobu Fujihara

Принадлежит: Hitachi Global Storage Technologies Netherlands BV

An apparatus and method for writing data to be played back onto a tape is provided. Included is an acquisition unit for acquiring data to be written onto the tape, a writing unit for writing the data to the tape, and a determination unit for determining a data amount of a leading part of the data to be stored in a place separate from a place where the data is stored so that a part following the leading part is made ready to be played back before playback of the leading part ends, to reduce the time taken to read the data from the tape. Also included is an extraction unit for extracting the data and a storage unit for storing the leading part of the data.

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Номер записи: 13

13-09-2012 дата публикации

Dynamic guarding of a storage media

Номер: US20120233432A1

Автор: Jonathan Williams Haines, Timothy Richard Feldman

Принадлежит: SEAGATE TECHNOLOGY LLC

A fixed data region on a storage medium may be allocated with one of a variety of allocation schemes (e.g., a randomly writable allocation scheme, a non-randomly writeable allocation scheme with a first data isolator spacing, a non-randomly writeable allocation scheme with a second data isolator spacing, and a non-randomly writeable allocation scheme with no dynamic isolators). Dynamic sub-region spacing refers at least to the number of data tracks in a data region of a magnetic disc between dynamic isolators and the number of bits in a data region in flash memory between dynamic isolators. The presently disclosed technology adapts isolators on the storage medium to create dynamic sub-regions based on characteristics of the storage medium, characteristics of the data, and/or expected access patterns of data to be written to the storage medium.

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Номер записи: 14

18-10-2012 дата публикации

Efficient connection management in a sas target

Номер: US20120265903A1

Автор: Arie Peled

Принадлежит: ANOBIT TECHNOLOGIES LTD

A method includes pre-configuring a hardware-implemented front-end of a storage device with multiple contexts of respective connections conducted between one or more hosts and the storage device. Storage commands, which are received in the storage device and are associated with the connections having the pre-configured contexts, are executed in a memory of the storage device using the hardware-implemented front-end. Upon identifying a storage command associated with a context that is not pre-configured in the hardware-implemented front-end, software of the storage device is triggered to configure the context in the hardware-implemented front-end, and the storage command is then executed using the hardware-implemented front-end in accordance with the context configured by the software.

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Номер записи: 15

01-11-2012 дата публикации

Disk drive suspension having flexure and load beam with insulating space between load beam and conductor of flexure

Номер: US20120275065A1

Автор: Naoki Yamaguchi, Yukie Yamada

Принадлежит: NHK Spring Co Ltd

A slit is formed between two opposite side portions of a metal base made of an electrically conductive material. The slit penetrates the metal base thicknesswise and extends longitudinally relative to the metal base. An insulating layer is formed on the metal base. A first conductor is formed within the slit. The first conductor extends longitudinally relative to the metal base along the slit. A second conductor is formed on the insulating layer. The second conductor faces the first conductor across the insulating layer. The second conductor extends longitudinally relative to the metal base along the first conductor. The metal base and the first conductor consist of a common base material, such as a stainless-steel plate. The first conductor is formed by etching the base material.

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Номер записи: 16

08-11-2012 дата публикации

Printed circuit cable assembly for a hard disk drive

Номер: US20120281306A1

Автор: Ramlah Binte Abdul Razak

Принадлежит: Texas Instruments Inc

A printed circuit cable assembly (PCCA) for a hard disk drive (HDD) is disclosed. The PCCA includes a stiffener portion having an elongated shape that includes an integrated circuit (IC) chip. The PCCA also includes a flexible portion extending from the elongated stiffener portion, wherein the PCCA is configured to be mountable on a headstack of the HDD such that an entire footprint of the IC chip overlays a metallic portion of the headstack of the HDD.

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Номер записи: 17

08-11-2012 дата публикации

Extended logical worm data integrity protection with unique worm identifier in header and database

Номер: US20120284467A1

Автор: Jonathan W. Peake, Joseph M. Swingler, Mark A. Reid, Thomas W. Bish

Принадлежит: International Business Machines Corp

A data storage system stores logical data object(s), each identified by a logical identifier. A control is configured to assign a unique WORM (Write Once Read Many) identifier to the logical data object, and stores the unique WORM identifier as associated with the logical identifier, in a database maintained by the control so as to be persistent. Data storage is configured to write the logical data object with a header with the unique WORM identifier. The control, in order to allow the logical data object to be accessed externally to the control, requires matching the unique WORM identifier in the header of a logical data object to the unique WORM identifier of the persistent database for the logical object. The unique WORM identifier is formed of a checksum hash value related to nonce fields comprising at least the logical identifier of the logical data object, and an incrementing token.

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Номер записи: 18

29-11-2012 дата публикации

Implementing enhanced deterministic memory allocation for indirection tables for persistent media

Номер: US20120303928A1

Автор: David Robison Hall

Принадлежит: Hitachi Global Storage Technologies Netherlands BV

A method and a storage system are provided for implementing deterministic memory allocation for indirection tables for persistent media or disk drives, such as, shingled perpendicular magnetic recording (SMR) indirection tables. A plurality of fixed-size memory pools are used to store indirection data. The distribution of pool allocate sizes is fixed. A pool allocate size is selected based upon an indirection system request size.

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Номер записи: 19

03-01-2013 дата публикации

Channel circuit and seek method

Номер: US20130003209A1

Автор: Keiichi KISHINO

Принадлежит: Toshiba Corp

A channel circuit includes a reader, a decoder, a prediction module, and a seek module. The reader reads data written in a medium. The decoder performs iterative decoding of the read data. The prediction module predicts whether an early read is possible or not without waiting for arrival of the read data. The seek module continuously initiates a seek when the prediction module predicts that the read is possible.

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Номер записи: 20

31-01-2013 дата публикации

Inter-track interference cancelation in the presence of frequency offset

Номер: US20130027801A1

Автор: Jason Bellorado, Kai Keung Chan, Marcus Marrow, Naveen Kumar

Принадлежит: Link A Media Devices Corp

An initial phase offset between a center track and a side track is determined. An initial side track pulse shape is determined using the initial phase offset and side track interference. The initial side track pulse shape minimizes a contribution of the side track interference to a center track bit. The contribution of the side track interference is removed from the center track bit using the initial side track pulse shape and the side track interference.

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Номер записи: 21

28-03-2013 дата публикации

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

Номер: US20130077453A1

Автор: Michael Alex

Принадлежит: Western Digital Technologies Inc

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

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Номер записи: 22

25-04-2013 дата публикации

Implementing magnetic defect classification using phase modulation

Номер: US20130100550A1

Автор: Martin Aureliano Hassner, Richard Leo Galbraith, Satoshi Yamamoto, Travis Roger Oenning, Weldon Mark Hanson

Принадлежит: Hitachi Global Storage Technologies Netherlands BV

A method, apparatus, and system are provided for implementing magnetic defect classification using phase modulation for hard disk drives. A magnetic media readback signal of a hard disk drive is processed to identify predefined phase modulation (PM) characteristics to implement magnetic defect classification of magnetic media bump and pit defects.

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Номер записи: 23

09-05-2013 дата публикации

System and method for applying magnetic strip onto cards

Номер: US20130112758A1

Автор: Richard EDMISTEN

Принадлежит: Profold Inc

A method of forming a card having a magnetic strip is disclosed and includes advancing a planar card member along a predetermined path of travel. The card member has opposing surfaces. A longitudinal strip of slurry comprising magnetically conductive particles is applied onto a surface of the card member. The magnetically conductive particles are magnetically aligned. The longitudinal strip of magnetically conductive particles are radiation cured to form the magnetic strip on the surface of the card member.

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Номер записи: 24

16-05-2013 дата публикации

Methods and Apparatus for Map Detection with Reduced Complexity

Номер: US20130120867A1

Автор: Haratsch Erich F., K. Fitzpatrick Kelly

Принадлежит: Agere Systems LLC

Methods and apparatus are provided for high-speed, low-power, high-performance channel detection. A soft-output detector is provided for processing a received signal, comprising: a forward detector for calculating forward state metrics; a backward detector for calculating backward state metrics; and a current branch detector for calculating a current branch metric, wherein at least two of the forward detector, the backward detector and the current branch detector employ trellis structures with a different number of states. A method is provided for processing a received signal using a soft-output detector, comprising: calculating forward state metrics using a forward detector; calculating backward state metrics using a backward detector; and calculating a current branch metric using a current branch detector, wherein at least two of the forward detector, the backward detector and the current branch detector employ trellis structures with a different number of states. 1. A soft-output detector for processing a received signal , comprising:a forward detector for calculating forward state metrics;a backward detector for calculating backward state metrics; andcurrent branch detector for calculating a current branch metric, wherein at least two of said forward detector, said backward detector and said current branch detector employ trellis structures with a different number of states.2. The soft-output detector of claim 1 , wherein said forward detector uses a four state claim 1 , radix 2trellis with or without feedback claim 1 , with N≧2 claim 1 , where N is a number of received samples.3. The soft-output detector of claim 1 , wherein said backward state metrics are unraveled by setting initial backward state metrics to 0 and calculating a best path leaving each current backward state in a forward direction.4. The soft-output detector of claim 1 , wherein forward branch metrics are used by said forward detector to calculate said forward state metrics and also used by ...

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Номер записи: 25

16-05-2013 дата публикации

INTEGRATED RECORDING HEAD WITH SELECTIVE MOVEMENT

Номер: US20130120878A1

Автор: Meyer Dallas W.

Принадлежит:

A recording head for use in magnetic storage devices is disclosed. The recording head includes a transducer that is bi-directionally movable with respect to a surface of the magnetic storage medium, thereby enabling improved positioning of the transducer during recording head read and write operations. Various structures are disclosed to bi-directionally actuate the recording head transducer. In one embodiment, an interleaver assembly having a plurality of flexure assemblies employs a motor including magnetic portions for selective, bi-directional actuation. In another embodiment, electrostatic charges are employed in the flexure assemblies for selective actuation. In yet another embodiment, piezoelectric elements are included to provide for selective actuation. 1. A recording head for use in a magnetic storage device having a magnetic medium , comprising:a slider body;a transducer body containing a transducer; first and second interconnect regions, the first and second interconnect regions connected to the slider body;', 'a body portion having a central portion extending between the first and second interconnect regions, the body portion being connected to the transducer body; and', a plurality of resilient flexure beams that extend between and attach to a respective one of the first and second interconnect regions and the central portion; and', 'a plurality of cantilevered beams that extend between a respective one of the first and second interconnect regions and the central portion, wherein each cantilevered beam is configured to be electrically charged to provide a motional force to selectively move at least one of the first and second flexure assemblies, wherein movement of at least one of the first and second flexure assemblies causes corresponding movement of the transducer with respect to both the slider body and a surface of the magnetic medium., 'first and second flexure assemblies that respectively interconnect the first and second interconnect region ...

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Номер записи: 26

30-05-2013 дата публикации

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

Номер: US20130135765A1

Автор: David John Seagle, John Thomas Contreras, Samir Y. Garzon

Принадлежит: Individual

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

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Номер записи: 27

13-06-2013 дата публикации

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

Номер: US20130148229A1

Автор: Bruce Alvin Gurney, Bruce Wilson, Neil Smith, Patrick Mesquita Braganca, Rehan Ahmed Zakai, Richard Leo Galbraith

Принадлежит: Hitachi Global Storage Technologies Netherlands BV

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

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Номер записи: 28

13-06-2013 дата публикации

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

Номер: US20130148232A1

Автор: Changyou Xu, Chung-Li Wang, Lei Chen, Shaohua Yang, YANG Han, Zongwang Li

Принадлежит: LSI Corp

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

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Номер записи: 29

20-06-2013 дата публикации

TAPE BUFFER USED TO REDUCE TAPE BACKHITCHES DURING WRITING OPERATIONS

Номер: US20130155540A1

Автор: Katagiri Takashi

Принадлежит: INTERNATIONAL BUSINESS MACHINES CORPORATION

According to one embodiment, a method includes writing, to a regular recording region of a tape medium after having written a first data accumulated in a buffer to a temporary recording region of the tape medium without an accompanying backhitch, a first data group that includes the first data that has any gaps between data eliminated, predicting a second volume of a second data, to be written in response to a command that is sent after the first data has been written to the regular recording region, judging whether the first volume exceeds a first threshold and whether or the second volume exceeds a second threshold, and writing the second data to the regular recording region without an accompanying backhitch when it has been judged that the first volume exceeds the first threshold and the second volume exceeds the second threshold. 1. A device , comprising:a buffer;logic adapted to accumulate data sent from a higher order device in the buffer; a first operation to write the data accumulated in the buffer to a regular recording region of a tape medium without an accompanying backhitch; or', 'a second operation to write the data accumulated in the buffer to a temporary recording region of the tape medium without an accompanying backhitch, and to subsequently write to the regular recording region a data group that includes the data written to the temporary recording region that has any gaps between data eliminated prior to writing to the regular recording region;, 'logic adapted to, in response to a command sent from the higher order device, selectively perform eitheran acquisition component adapted to acquire a first volume of first data, at a time that the first data has been written to the regular recording region, by either the first operation or the second operation having been performed in response to the command;a prediction component adapted to predict a second volume of second data to be written in response to a command which is sent after the first data has ...

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Номер записи: 30

11-07-2013 дата публикации

Interleaved circuit of flexure for disk drive

Номер: US20130176646A1

Автор: Hajime Arai

Принадлежит: NHK Spring Co Ltd

An interleaved circuit has first branch conductors branching from a first conductor, second branch conductors branching from a second conductor, a metal base, an insulating layer of a dielectric, and a cover resin layer. The metal base comprises an opening. The first branch conductors and the second branch conductors are arranged alternately in a transverse direction of the insulating layer. A slit is formed in the insulating layer and the cover resin layer. The slit comprises a pair of opposite walls and an air gap between the opposite walls. Air introduced into the air gap forms an air layer. The slit extends longitudinally relative to the interleaved circuit along at least a part of the branch conductors.

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Номер записи: 31

11-07-2013 дата публикации

Light delivery guide

Номер: US20130176839A1

Автор: Chubing Peng

Принадлежит: SEAGATE TECHNOLOGY LLC

A waveguide that includes a first cladding layer, the first cladding layer having an index of refraction, n 3 ; a gradient index layer positioned adjacent the first cladding layer; an assist layer positioned adjacent the gradient index layer, the assist layer having an index of refraction, n 2 ; a core layer positioned adjacent the assist layer, the core layer having an index of refraction, n 1 ; and a second cladding layer, the second cladding layer having an index of refraction, n 4 , wherein n 1 is greater than n 2 , n 3 , and n 4 ; and n 2 is greater than n 3 and n 4 .

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Номер записи: 32

18-07-2013 дата публикации

Data Storage Device, Apparatus And Method For Using Same

Номер: US20130180101A1

Автор: Bert D. Cook, Donald C. Mann

Принадлежит: UltraCard Inc

A data storage device serving as a portable card, magnetically encodeable card, or a magnetic credit card is shown. The data storage device includes a substrate having at least one surface. A high density, magnetically coercive material layer is disposed on or is deposited on the substrate for storing magnetic signals. The magnetically coercive material may have an axis of magnetization that is oriented in a predetermined direction relative to the at least one surface of the substrate. A layer of non-magnetically material is disposed on the substrate for defining an exchange break layer. A relatively hard, abradeable protective coating is formed on the magnetic material layer and has a thickness between a maximum thickness that materially attenuates magnetic signals passing between the magnetic material layer and a transducer and a minimum thickness enabling the protective coating to be abraded by usage in an ambient natural atmosphere operating environment.

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Номер записи: 33

29-08-2013 дата публикации

Fly Height Extraction System

Номер: US20130222942A1

Автор: Robert Glenn Biskeborn

Принадлежит: International Business Machines Corp

A system and method for monitoring fly height between a magnetic recording medium and a transducing head. In a first exemplary embodiment, magnetic spacing change value is calculated using media noise on the recording medium (instead of prerecorded tones) to provide a broadband frequency distribution that results in improved Wallace equation accuracy. In a second exemplary embodiment, a magnetic spacing change value is acquired by any suitable method but is adjusted as necessary to reflect transducing head wear, thus providing a methodology for calculating changes in fly height by taking into account the signal loss that is attributable to wear. In this way, a basic understanding of the mechanism causing changes in magnetic spacing is achieved.

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Номер записи: 34

05-09-2013 дата публикации

Customizing a range of acceptable tape dimensional stability write conditions

Номер: US20130229724A1

Автор: Edwin R. Childers, Paul J. Seger, Reed A. Hancock

Принадлежит: International Business Machines Corp

Described are embodiments of an invention for customizing the range of acceptable write conditions to a tape of a tape cartridge that contracts or expands laterally based on environmental conditions. The tape drive utilizes servo information to determine if the tape has expanded or contracted from the nominal dimension and to determine the magnitude of the expansion or contraction. In the case of expansion, the magnitude of the determined expansion and the stored maximum amount of contraction must be below a predetermined threshold value to allow a write. In the case of contraction, the magnitude of the determined contraction and the stored magnitude of expansion must be below the same predetermined threshold value to allow a write. If the determined magnitude of contraction or expansion is greater than the stored magnitude of contraction or expansion, respectively, then the new extreme is stored.

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Номер записи: 35

12-09-2013 дата публикации

MAGNETIC DISK CONTROL DEVICE, MAGNETIC DISK APPARATUS, MAGNETIC DISK CONTROL METHOD AND COMPUTER PROGRAM

Номер: US20130235486A1

Автор: HIROSE Katsuhiko

Принадлежит: NEC Corporation

A magnetic disk control device according to an exemplary of the invention includes a write controller to control, in a magnetic disk having tracks, the track being a storage area made by concentrically dividing a magnetic recording layer formed onto a disk into a plurality of areas, the track being divided into a plurality of areas in a rotative direction as sectors, writing information into the each sector; and a substitution controller to make, by detecting the sector or the track written at a frequency higher than a writing frequency based on a number of times of writing by the write controller to the sector or the track and by moving information recorded in an adjacent track adjacent to a high-writing-frequency track including the detected high writing frequency sector or to a high-writing-frequency track which is detected as a high writing frequency track to a track of a substitution area. 1. A magnetic disk control device , comprising:a write controller to control, in a magnetic disk having tracks, the each track being a storage area made by concentrically dividing a magnetic recording layer formed onto a disk into a plurality of areas, the each track being further divided into a plurality of areas in a rotative direction as sectors, writing information into the each sector; anda substitution controller to make, by detecting the sector or the track written at a frequency higher than a prescribed writing frequency based on a number of times of writing by the write controller to the sector or the track per prescribed unit time and by moving information recorded in an adjacent track adjacent to a high-writing-frequency track including the detected high writing frequency sector or to a high-writing-frequency track which is detected as a high writing frequency track to a track of a substitution area set in advance, the adjacent track be in an idle status, the idle status being a status of not being used.2. The magnetic disk control device according to claim 1 , ...

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Номер записи: 36

19-09-2013 дата публикации

Write delay stabilization

Номер: US20130242428A1

Автор: Bruce Douglas Buch, David Erich Tetzlaff

Принадлежит: SEAGATE TECHNOLOGY LLC

Apparatus and method for write delay stabilization. A write driver is adapted to output bipolar write currents to write data to a memory. A preconditioning circuit is adapted to output first and second thermal preconditioning currents through the write driver to stabilize a write delay associated with the write driver to a steady-state level prior to the writing of data to the memory.

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Номер записи: 37

03-10-2013 дата публикации

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

Номер: US20130258524A1

Автор: Koike Hayato, OIKAWA Tohru, SASAKI Tomoyuki

Принадлежит: TDK Corporation

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

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Номер записи: 38

03-10-2013 дата публикации

High areal density tape format and head

Номер: US20130258526A1

Автор: Robert Glenn Biskeborn, Wayne Isami Imaino

Принадлежит: International Business Machines Corp

A magnetic recording tape according to one embodiment includes at least about eight data bands, wherein each data band is defined between a pair of adjacent servo tracks, each pair of adjacent servo tracks defining only a single data band therebetween. One of the servo tracks has data encoded therein, the data including data for encryption. A magnetic recording tape according to another embodiment includes a plurality of servo tracks, each servo track comprising a series of magnetically defined bars. An average height of the bars is less than about 50 microns. About eight to about twenty six data bands are present on the tape. A tape supply cartridge according to various embodiments has a magnetic recording tape as described herein.

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Номер записи: 39

24-10-2013 дата публикации

Combined soft detection/soft decoding in tape drive storage channels

Номер: US20130279040A1

Автор: Robert A. Hutchins, Roy D. Cideciyan, Sedat Oelcer, Thomas Mittelholzer

Принадлежит: International Business Machines Corp

In one embodiment, a tape drive system includes a soft detector for executing a first forward loop of a detection algorithm on a first block of signal samples during a first time interval; and logic for executing forward and reverse loops during several time intervals; and logic adapted for outputting a first decoded block of signal samples based on the executing the decoding algorithm on the first block during a sixth time interval, wherein a sum of second, third, fourth, fifth, and sixth time intervals are about equal in duration to the first time interval.

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Номер записи: 40

31-10-2013 дата публикации

Head wrap procedure

Номер: US20130286503A1

Автор: Ernest S. Gale, Kazuhiro Tsuruta, Nhan X. Bui, Reed A. Hancock

Принадлежит: International Business Machines Corp

A method according to one embodiment includes detecting a signal originating from at least one reader of a first outer module of a head as a tape passes thereacross, the head having at least the first outer module and a second outer modules positioned on opposite sides of an inner module and aligned with the inner module in a direction of tape travel thereacross. A first guide positioned in front of the first outer module is moved in a direction towards the tape until the signal detected by the first outer module decreases. The first guide is moved in a direction away from the tape to a position to set about a predetermined wrap angle of the tape relative to the first outer module after the signal detected by the first outer module decreases.

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Номер записи: 41

07-11-2013 дата публикации

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

Номер: US20130293977A1

Автор: Tinker Joshua Bartholomew

Принадлежит:

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

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Номер записи: 42

07-11-2013 дата публикации

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

Номер: US20130294207A1

Автор: Darren W. Karns, Edward Charles Gage, Kaizhong Gao, Mehmet Fatih Erden, Yimin Niu

Принадлежит: SEAGATE TECHNOLOGY LLC

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

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Номер записи: 43

14-11-2013 дата публикации

DISK DRIVE SUSPENSION AND MANUFACTURING METHOD THEREFOR

Номер: US20130301164A1

Автор: KUCHIWAKI Isamu, Nishida Tatsuhiko

Принадлежит: NHK SPRING CO., LTD.

An actuator mounting section comprises a plate member includes a first plate and a second plate. The first plate is formed with an opening which accommodates an actuator element. The second plate comprises a main body portion which overlaps the first plate and supporting portions which support opposite ends of the actuator element. A narrow portion narrower than the first plate is formed at a part of the main body portion of the second plate. A weld seal portion is formed by laser-welding the first plate and the second plate at the narrow portion. Adhesive is provided between the opposite ends of the actuator element and an inner surface of the opening of the first plate. 1. A disk drive suspension with an actuator element , comprising:a first plate comprising an opening which accommodates the actuator element, a stationary part to which one end of the actuator element is secured, and a movable part to which the other end of the actuator element is secured;a second plate comprising a main body portion, which overlaps the first plate thicknesswise, and supporting portions, which support the opposite ends of the actuator element, and formed with a narrow portion narrower than the first plate, on a part of the main body portion;a weld seal portion configured to secure the first plate and the second plate together at the narrow portion; andadhesive provided between the opposite ends of the actuator element and an inner surface of the opening.2. The disk drive suspension of claim 1 , wherein the narrow portion is formed in a region near the supporting portion and narrower than the width of the supporting portion.3. The disk drive suspension of claim 2 , wherein a plurality of narrow portions are arranged spaced apart from one another claim 2 , transversely relative to the supporting portion claim 2 , and the weld seal portion is provided on each of the narrow portions.4. The disk drive suspension of claim 1 , wherein the first plate comprises a bridge portion connecting ...

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Номер записи: 44

21-11-2013 дата публикации

DISK-DRIVE PULSE DURATION CONTROL SYSTEM

Номер: US20130308222A1

Автор: Dina Marius Vicentiu, Kuehlwein Jeremy Robert

Принадлежит: TEXAS INSTRUMENTS INCORPORATED

One embodiment includes a pulse duration control system for a magnetic disk-drive system. A rise delay system generates first control voltages in response to a write data input signal changing between a first state and a second state. A fall delay system generates second control voltages in response to the write data input signal changing between the first and second states. A comparator system generates a rising-edge overshoot signal and a falling-edge overshoot signal based on a comparison of the first and second control voltages. The rising-edge overshoot signal can set a duration of a positive overshoot current pulse for a write current at a transition of the write data input signal from the first state to the second state, and the falling-edge overshoot signal can set a duration of a negative overshoot current pulse for the write current at a transition from the second state to the first state. 1. A pulse duration control system for a magnetic disk-drive system , the system comprising:a rise delay system configured to generate a first plurality of control voltages in response to a write data input signal changing between a first state and a second state;a fall delay system configured to generate a second plurality of control voltages in response to the write data input signal changing between the first state and the second state; anda comparator system configured to generate a rising-edge overshoot signal and a falling-edge overshoot signal based on a comparison of the first and second pluralities of control voltages, the rising-edge overshoot signal being associated with a duration of a positive overshoot current pulse for a write current at a transition of the write data input signal from the first state to the second state, and the falling-edge overshoot signal being associated with a duration of a negative overshoot current pulse for the write current at a transition of the write data input signal from the second state to the first state.2. The system of ...

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Номер записи: 45

05-12-2013 дата публикации

Shingled magnetic recording disk drive with compensation for the effect of far track erasure (fte) on adjacent data bands

Номер: US20130321948A1

Автор: Damien Cyril Daniel Le Moal, Shad Henry Thorstenson, Zvonimir Z. Bandic

Принадлежит: Individual

A shingled magnetic recording (SMR) disk drive has concentric shingled data tracks having data sectors with physical block addresses (PBAs), with the tracks being arranged in annular bands separated by annular inter-band gaps. The disk drive also has an on-disk extended cache region and may have writable inter-band cache (IBC) tracks in the inter-band gaps. A count is maintained in memory for each band and each IBC, and the count is incremented for each writing to a band or an IBC. When a count for a band or IBC reaches a predetermined threshold, the data is read from the tracks in the boundary region of the adjacent band that are within the range of the FTE and that data is then written to the extended cache. The FTE-affected tracks are then invalidated, meaning that PBAs can no longer be assigned to the data sectors in those tracks.

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Номер записи: 46

05-12-2013 дата публикации

Magnetic tape recording in data format using an efficient reverse concatenated modulation code

Номер: US20130326311A1

Автор: Robert A. Hutchins, Roy D. Cideciyan, Sedat Oelcer, Thomas Mittleholzer

Принадлежит: International Business Machines Corp

In one embodiment, a method for writing data to a magnetic tape utilizing a rate-(232/234) reverse concatenated modulation code includes receiving a data stream comprising one or more data sets, separating each data set into a plurality of sub data sets, encoding each sub data set with a C2 encoding, encoding each C2-encoded sub data set with the modulation code, encoding each modulated sub data set with a C1 encoding, and simultaneously writing the encoded modulated sub data sets to data tracks of the magnetic tape. Other methods for writing data to a magnetic tape utilizing a rate-(232/234) reverse concatenated modulation code are described according to various other embodiments.

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Номер записи: 47

16-01-2014 дата публикации

System, method and apparatus for selection of reserved area data tracks

Номер: US20140016224A1

Автор: Takeshi Shikama, Toshiroh Unoki

Принадлежит: HGST NETHERLANDS BV

Selection of disk drive data tracks for the location of reserved area include providing a media disk with data tracks comprising a user data region. A location is assessed on the media disk with a highest frequency of adjacent track interference and far track interference-refresh potential. The location is then configured to be a reserved area where no user data is written. The reserved area has parameters that are read out first before the disk drive enters an operation enabled state for user interface.

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Номер записи: 48

16-01-2014 дата публикации

DATA STORAGE SYSTEM, METHOD OF WRITING TO STORAGE IN THE DATA STORAGE SYSTEM, HARD DISK AND METHOD OF FORMING THE HARD DISK

Номер: US20140019680A1

Автор: CHING Zhi Yong, JIN Chao, XI Weiya, YONG Khai Leong

Принадлежит:

In various embodiments, a data storage system may be provided. The data storage system may include a storage. The storage may include a first portion and a second portion. The data storage system may further include a determination circuit configured to determine whether to write data to the first portion or to the second portion. The data storage system may also include a control circuit configured to control writing the data to the first portion in a log structured manner. 1. A data storage system for accessing a storage , the storage comprising a first portion and a second portion , the data storage system comprising:a determination circuit configured to determine whether to write data to the first portion or to the second portion; anda control circuit configured to control writing the data to the first portion in a log structured manner.2. The data storage system according to claim 1 ,wherein the control circuit is further configured to control writing data to the second portion in a random access manner.3. The data storage system according to claim 1 , to control writing data in the form of a circular log in the first portion, the log having a header and an end defining the data written to the first portion; and', 'to append new data to the header of the log, the new data causing the header to move relative to the end., 'wherein to control writing data to the first portion in the log structured manner comprises'}4. The data storage system according to claim 3 , the data storage system further comprising:a marking circuit configured to mark unwanted old data on the first portion.5. The data storage system according to claim 4 , 'to control writing of new data over old data by appending unmarked old data to the header and to remove marked old data.', 'wherein to control writing data to the first portion in the log structure manner comprises6. The data storage system according to claim 1 ,wherein the determination circuit is further configured to determine whether ...

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Номер записи: 49

23-01-2014 дата публикации

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

Номер: US20140025885A1

Автор: Cory G. Smith, Duke A. Lee, Erika M. Dawson, Gavin S. Johnson, Joel K. Lyman, Jon A. Lynds, Paul M. Greco, Scott M. Fry

Принадлежит: International Business Machines Corp

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

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Номер записи: 50

30-01-2014 дата публикации

Disk storage apparatus and data protection method

Номер: US20140029126A1

Автор: Takayuki Kawabe, Tatsuo Nitta

Принадлежит: Toshiba Corp

A disk storage apparatus according to one embodiment includes a head, a storage device, a write module and a controller. The head writes data on a disk. The storage device has a storage area for temporarily storing the data written by the head. The write module writes data to tracks on a disk, while partially overlapping the data with previously written data to adjacent track. The controller detects a drift-off write of the head while writing data, determines a drift-off write area in which the drift-off write is occurred, and protects the data written in the storage area, if the data is written in the drift-off write area.

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Номер записи: 51

30-01-2014 дата публикации

Over-the-Rail Write Driver for Magnetic Storage Systems

Номер: US20140029127A1

Автор: Michael Joseph Peterson, Paul Mark Mazur

Принадлежит: LSI Corp

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

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Номер записи: 52

30-01-2014 дата публикации

TRANSPORT SYSTEM FOR TRANSPORTING MAGNETIC TAPE

Номер: US20140029134A1

Автор: Engelen Johan B.C., Furrer Simeon, Lantz Mark A.

Принадлежит:

A transport system for transporting magnetic tape includes at least one roller for guiding the magnetic tape having at least one electrode, wherein the at least one electrode is configured to be charged triboelectrically so as to produce a force of attraction between the magnetic tape and the at least one electrode. 1. A transport system for transporting magnetic tape , comprising:at least one roller configured to guide the magnetic tape having at least one electrode;wherein the at least one electrode is configured to be charged triboelectrically so as to produce a force of attraction between the magnetic tape and the at least one electrode.2. The transport system of claim 1 , wherein a plurality of electrodes is provided claim 1 , each electrode being configured to be charged triboelectrically so as to produce a force of attraction between the magnetic tape and the at least one electrode.3. The transport system of claim 2 , wherein the electrodes are formed as islands embedded in a circumferential surface of the at least one roller claim 2 , the islands and/or the circumferential surface being configured for contacting the magnetic tape.4. The transport system of claim 3 , wherein the islands are electrically isolated from each other by the circumferential surface of the at least one roller.5. The transport system of claim 3 , wherein the islands have a top surface flush with the circumferential surface of the at least one roller.6. The transport system of claim 3 , wherein the islands each have a round shape.7. The transport system of claim 3 , wherein the islands are arranged spaced apart from each other in a circumferential direction of the roller and/or in a longitudinal direction of the at least one roller.8. The transport system of claim 3 , wherein the circumferential surface of the at least one roller comprises an electrically insulating material.9. The transport system of claim 1 , wherein the at least one electrode comprises metal.10. The transport system ...

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Номер записи: 53

06-02-2014 дата публикации

Writing data to tape storage medium

Номер: US20140036383A1

Автор: Roy D. Cideciyan, Simeon Furrer

Принадлежит: International Business Machines Corp

A method for writing data to a tape storage medium includes: writing first user data to a first physical region ( 11 ) of the tape storage medium ( 1 ) in a first write mode, writing second user data to a second physical region ( 12 ) of the tape storage medium ( 1 ) in a second write mode, wherein the second write mode differs from the first write mode. An apparatus for writing data to a tape storage medium, a tape storage medium, a tape cartridge are also provided.

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Номер записи: 54

13-02-2014 дата публикации

Medium processing device and flexible cable

Номер: US20140041896A1

Автор: Kazunori Takahashi, Toshiro Shiomi

Принадлежит: Nidec Sankyo Corp

A medium processing device may include a head which reads or writes data to a recording medium; and a flexible cable which is connected with head. The flexible cable may be formed in a multilayer structure including a data signal layer formed with a data signal pattern and disconnection detecting signal layers which cover a front face and a rear face of the data signal layer and are formed with a disconnection detecting signal pattern. The flexible cable may also include a terminal connecting part formed with a through hole into which a signal terminal of the head is inserted and a terminal covering part turned around so as to cover the terminal connecting part and fixed to the terminal connecting part.

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Номер записи: 55

13-02-2014 дата публикации

Method and Apparatus for Reading a Non-Volatile Memory Using a Spin Torque Oscillator

Номер: US20140043709A1

Автор: EDELSTEIN ALAN S.

Принадлежит: U.S. ARMY RESEARCH LABORATORY

A method and apparatus for reading electronic memory comprising a current source, a spin transfer oscillator, an external field source, coupled to the current source, for generating an RF signal, the spin torque oscillator positioned proximate a magnetic media comprising a plurality of bit regions of varying magnetic permeability, wherein a frequency of the RF signal varies in response to the permeability of a bit region in the plurality of bit regions being proximate the spin torque oscillator. 1. An apparatus for reading electronic memory comprising:a current source;an external magnetic field source;a spin transfer oscillator, coupled to the current source, for generating an RF signal;the spin torque oscillator positioned proximate a magnetic media comprising a plurality of bit regions of varying magnetic permeability, wherein a frequency of the RF signal varies in response to the permeability of a bit region in the plurality of bit regions being proximate the spin torque oscillator.2. The apparatus of claim 1 , further comprising a spectrum analyzer connected to the spin transfer oscillator for measuring the frequency and/or amplitude of the RF signal.3. The apparatus of claim 2 , wherein the spectrum analyzer measures changes in the RF signal to indicate a permeability of the region.4. The apparatus of claim 1 , further comprising a superheterodyne receiver to determine a frequency shift in the RF signal indicating a permeability of the bit region.5. The apparatus of claim 1 , further comprising multilevel signaling of n-level bits based on permeability of the bit region.6. The apparatus of claim 1 , further comprising an external magnetic field source for generating a magnetic field proximate the STO.7. The apparatus of claim 6 , wherein the external magnetic field modifies a precession frequency of the spin torque oscillator.8. The apparatus of claim 1 , wherein the spin torque oscillator generates a magnetic field that can be modified by the media and the ...

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Номер записи: 56

20-02-2014 дата публикации

METHOD AND SYSTEM FOR READING FROM OR WRITING TO MULTIPLE SURFACES OF A DISK

Номер: US20140049854A1

Автор: Ho Son Hong

Принадлежит: MARVELL WORLD TRADE LTD.

A system includes a management module transferring sectors between an interface or a memory and ports. The management module transfers a first portion of a first sector to or from a first port while transferring to or from a second port a second portion of the first sector or a first portion of a second sector. A first channel module reads from or writes to a first surface of a disk via a first head by transferring the first portion of the first sector to or from a first amplifier module. A second channel module, while the first channel module transfers the first portion of the first sector to or from the first amplifier module, reads from or writes to a second surface of the disk via a second head by transferring to or from a second amplifier module the second portion or the first portion of the second sector. 1. A system comprising:a management module configured to transfer a first sector of data and a second sector of data between (i) an interface or a memory and (ii) a plurality of ports, wherein the interface is connected to a host, wherein the plurality of ports comprise a first port and a second port, and wherein the management module is configured to transfer a first portion of the first sector of data to or from the first port while transferring to or from the second port either (i) a second portion of the first sector of data, or (ii) a first portion of the second sector of data;a first channel module configured to read from or write to a first surface of a disk via a first head by transferring the first portion of the first sector of data to or from a first amplifier module; anda second channel module configured to, while the first channel module transfers the first portion of the first sector of data to or from the first amplifier module, read from or write to a second surface of the disk via a second head by transferring to or from a second amplifier module either (i) the second portion of the first sector of data, or (ii) the first portion of the ...

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Номер записи: 57

06-03-2014 дата публикации

Variable stopwrite threshold using kurtosis

Номер: US20140063633A1

Автор: Kevin B. Judd, Randy C. Inch

Принадлежит: International Business Machines Corp

A method according to one embodiment includes measuring a current position error signal; calculating a standard deviation or a variance using the current position error signal sample; calculating a kurtosis value, using the current position error signal sample or derivative thereof; adjusting a threshold value using the kurtosis value; comparing the standard deviation or variance to the threshold value; enabling writing when the standard deviation or variance does not exceed the threshold value.

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Номер записи: 58

06-03-2014 дата публикации

Tape drive buffer utilization

Номер: US20140063634A1

Автор: Kevin Dale Butt, Paul Merrill Greco, Takashi Katagiri, Yuhko MORI

Принадлежит: International Business Machines Corp

Records and filemarks read from data segments are aggregated into at least one single data segment. The records and the filemarks are reorganized and restructured in the single data segment such that buffer utilization is improved.

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Номер записи: 59

06-03-2014 дата публикации

Systems and Methods for Conditional Positive Feedback Data Decoding

Номер: US20140063636A1

Автор: Fan Zhang, Shaohua Yang

Принадлежит: LSI Corp

The present inventions are related to systems and methods for information data processing included selective decoder message determination.

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Номер записи: 60

06-03-2014 дата публикации

PRE-AMPLIFIER OUTPUT STAGE WITH INTEGRATED TEST BUFFER

Номер: US20140063639A1

Автор: Dean Douglas Warren

Принадлежит: TEXAS INSTRUMENTS INCORPORATED

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

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Номер записи: 61

06-03-2014 дата публикации

Magnetic Element with Multiple Selective Transducing Elements

Номер: US20140063644A1

Автор: Brian William Karr, Declan Macken, Huazhou Lou, Manuel Charles Anaya Defresne

Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus and generally associated method may be directed to a magnetic reader capable of concurrently or independently data access and environmental measurements. Various embodiments construct such a magnetic reader with first and second data transducing elements that are each adapted to selectively read data and measure clearance from an adjacent data storage media.

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Номер записи: 62

13-03-2014 дата публикации

READ/WRITE APPARATUS AND READ/WRITE METHOD

Номер: US20140071559A1

Автор: Adachi Satoru, FUJITA Isao, Inoue Kenji, KAKUYA Takumi, Kanno Hironori, KITAHARA Masakazu, Sasaki Kiyotaka, SHITARA Masataka, Sugawara Nobuhiro, Toda Seiji, YAMAMOTO Michio

Принадлежит: KABUSHIKI KAISHA TOSHIBA

According to one embodiment, a read/write apparatus includes a receiver and a refresh module. The receiver receives a write command requesting a write to a magnetic disk. The refresh module refreshes, when a first area of the magnetic disk includes a second area corresponding to the write command, data written in a third area, the third area being an area obtained by excluding the second area from the first area. 1. A read/write apparatus comprising:a receiver configured to receive a write command requesting a write to a magnetic disk; anda refresh module configured to refresh, when a first area being refresh target of the magnetic disk comprises a second area corresponding to the write command, data written in a third area, the third area being an area obtained by excluding the second area from the first area.2. The apparatus of claim 1 , wherein the refresh module is further configured to execute a write according to the write command to the second area claim 1 , and then to refresh the data written in the third area.3. The apparatus of claim 1 , wherein the refresh module is further configured to merge data read from the first area with write data of the write command claim 1 , and write the merged data to the first area.4. The apparatus of claim 1 , wherein the receiver is further configured to receive a read command requesting a read from the magnetic disk claim 1 , andthe refresh module is further configured to read data from the first area, and write the read data to the first area, when the third area comprises an area corresponding to the read command.5. The apparatus of claim 4 , wherein the refresh module is further configured to decide whether or not the read data is to be written to the third area claim 4 , based on a read retry count when reading the data from the first area.6. The apparatus of claim 1 , further comprising a checking module configured to check whether or not the third area comprises divided areas claim 1 ,wherein the refresh module is ...

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Номер записи: 63

10-04-2014 дата публикации

PARTIAL WRITE SYSTEM

Номер: US20140098438A1

Автор: Poudyal Sundar

Принадлежит: SEAGATE TECHNOLOGY LLC

A method and system can be implemented to perform a read-modify-write operation on data recorded in a shingled media format. In one embodiment, a write operation on a band of data stored on a magnetic recording medium is initiated at an intermediate position within the band of data. This is particularly well-suited for data written by a shingled media write operation. 1. A method comprising:initiating a write operation on a band of data stored on a magnetic recording medium at an intermediate position within the band of data.2. The method as claimed in wherein the write operation comprises:utilizing shingled write operations.3. The method as claimed in and further comprising:reading less than the entire band of data from the magnetic recording medium; and then writing over less than the entire band of data on the recording medium.4. The method as claimed in and further comprising:receiving new data for insertion in the band of data;receiving position indication information indicating a target location in the band of data the new data is to be positioned.5. The method as claimed in and further comprising:reading less than the entire band of data from the magnetic recording medium as read data;storing the read data in temporary memory;replacing a portion of the read data in temporary memory with new data so as to form revised data; andwherein the initiating the write operation on the band of data stored on the magnetic recording medium at the intermediate position within the band of data comprises:writing the revised data into the band of data.6. The method as claimed in and further comprising:receiving new data for insertion in the band of data;determining that the new data is to be inserted in the last sector of the band of data;writing the new data over the last sector of the band of data without storing the last sector of data in temporary memory.7. The method as claimed in and further comprising:reading less than the entire band of data from the magnetic ...

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Номер записи: 64

02-01-2020 дата публикации

FLUID DYNAMIC BEARING DEVICE, MOTOR, AND DISK DRIVE DEVICE

Номер: US20200003254A1

Автор: SATO Kazuhiro, Takahashi Katsuya

Принадлежит:

A fluid dynamic bearing device includes a shaft disposed along a center axis, a sleeve cylindrically extending around the shaft, a thruster that closes a lower end of the sleeve, dynamic pressure grooves in the shaft or the sleeve, and a lubricating oil present therebetween. The shaft includes a shaft main body and a shaft flange extending radially outward from a lower end of the shaft main body. An inner peripheral surface of the sleeve includes a first inner peripheral surface that faces an outer peripheral surface of the shaft main body in the radial direction and a second inner peripheral surface that faces an outer peripheral surface of the shaft flange in the radial direction. The sleeve includes a sleeve inner lower surface and a circulation hole. 1. A fluid dynamic bearing device comprising:a shaft disposed along a center axis extending vertically;a sleeve including a through hole into which the shaft is inserted, the sleeve cylindrically extending in an axial direction around the shaft;a thruster disposed below the shaft in the axial direction to close an opening in a lower end of the sleeve;a plurality of dynamic pressure grooves defined in at least one of an outer peripheral surface of the shaft and an inner peripheral surface of the sleeve; anda lubricating oil present among the shaft, the sleeve, and the thruster; wherein a shaft main body extending along the center axis in a columnar shape; and', 'a shaft flange extending outward in a radial direction from a lower end of the shaft main body;, 'the shaft includes a first inner peripheral surface facing an outer peripheral surface of the shaft main body in the radial direction; and', 'a second inner peripheral surface that at least partially faces an outer peripheral surface of the shaft flange in the radial direction;, 'the inner peripheral surface of the sleeve includes a sleeve inner lower surface that connects a lower end of the first inner peripheral surface and an upper end of the second inner ...

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Номер записи: 65

03-01-2019 дата публикации

Managing Shingled Magnetic Recording (SMR) Zones in a Hybrid Storage Device

Номер: US20190004739A1

Автор: Baryudin Leonid, Forhan Carl, Hicken Michael Scott, Ish Mark, Tang Alex

Принадлежит:

Apparatus and method for managing data in a hybrid data storage device. The device has a first non-volatile memory (NVM) of solid state memory cells arranged into a first set of garbage collection units (GCUs), and a second NVM as a rotatable data recording medium arranged into a second set of GCUs each comprising a plurality of shingled magnetic recording tracks. A control circuit combines a first group of logical block units (LBUs) stored in the first set of GCUs with a second group of LBUs stored in the second set of GCUs to form a combined group of LBUs arranged in sequential order by logical address. The control circuit streams the combined group of LBUs to a zone of shingled magnetic recording tracks in a selected one of the second set of GCUs. A combined media translation map identifies physical addresses in both the first and second NVMs. 1. A hybrid data storage device comprising:a first non-volatile memory (NVM) comprising solid state memory cells arranged into a first set of garbage collection units (GCUs) each comprising a plurality of erasure blocks that are allocated and erased as a unit;a second NVM comprising a rotatable data recording medium arranged into a second set of GCUs each comprising a plurality of shingled magnetic recording tracks that are allocated and erased as a unit; anda control circuit configured to combine a first group of logical block units (LBUs) stored in the first set of GCUs with a second group of LBUs stored in the second set of GCUs to form a combined group of LBUs arranged in sequential order by logical address, and to write the combined group of LBUs to a zone of shingled magnetic recording tracks in a selected one of the second set of GCUs.2. The apparatus of claim 1 , further comprising a map stored as a data structure in a memory that correlates logical addresses of the LBUs to physical addresses in the respective first and second sets of GCUs at which the LBUs are stored claim 1 , the map comprising at least one flag ...

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Номер записи: 66

07-01-2016 дата публикации

DATA MANAGEMENT FOR A DATA STORAGE DEVICE WITH ZONE RELOCATION

Номер: US20160005423A1

Автор: NEPPALLI SRINIVAS, Olds Edwin Scott

Принадлежит:

Managing data stored on media of a Data Storage Device (DSD) using zone relocation. At least a portion of the media is logically divided into a plurality of zones and zones are identified with access counts greater than or equal to a threshold. The access count for each of the identified zones indicates a number of times data in the zone has been read or written. Data is relocated from at least one zone of the identified zones to at least one destination zone on the media to reduce a data access time between the identified zones. 1. A Data Storage Device (DSD) , comprising:at least one media for storing data; and logically divide at least a portion of the media into a plurality of zones;', 'identify zones of the plurality of zones with access counts greater than or equal to a threshold, wherein the access count for each of the identified zones indicates a number of times data in the zone has been read or written; and', 'relocate data from at least one of the identified zones to at least one destination zone on the media to reduce a data access time between the identified zones., 'a controller configured to2. The DSD of claim 1 , wherein the access count is a random access count indicating a number of times data in the zone has been non-sequentially read or written.3. The DSD of claim 1 , wherein the access count is a sequential access count indicating a number of times data in the zone has been sequentially read or written.4. The DSD of claim 1 , wherein the controller is further configured to update a mapping indicating physical locations for data stored on the media by offsetting physical addresses in the mapping for the relocated data.5. The DSD of claim 1 , wherein the controller is further configured to:logically divide the media into a plurality of blocks with each block having a larger data capacity than individual zones of the plurality of zones;identify a block of the plurality of blocks with a high access count relative to other blocks, wherein the access ...

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Номер записи: 67

07-01-2021 дата публикации

RECORDING DEVICE, READOUT DEVICE, RECORDING METHOD, RECORDING PROGRAM, READOUT METHOD, READOUT PROGRAM, AND MAGNETIC TAPE

Номер: US20210005221A1

Автор: KONDO Michitaka, Miyamoto Kentaro, Miyamoto Takashi

Принадлежит:

A recording device includes: a recording unit that records plural objects including data and metadata related to the data on a portable recording medium, and executes a process of recording first set data, which is a set of the metadata included in the object, at every predetermined timing after recording at least one of the objects, wherein each piece of the first set data is a set of the metadata included in the object recorded after recording of immediately preceding recorded first set data. 1. A recording device comprising:a recording unit that records a plurality of objects including data and metadata related to the data on a portable recording medium, and executes a process of recording first set data, which is a set of the metadata included in the object, at every predetermined timing after recording at least one of the objects,wherein each piece of the first set data is a set of the metadata included in the object recorded after recording of immediately preceding recorded first set data.2. The recording device according to claim 1 ,wherein the recording unit records second set data, which is a set of the recorded first set data, on the portable recording medium after recording at least one of the first set data.3. The recording device according to claim 2 ,wherein the recording unit overwrites and records the object on the second set data in a case where a size of the second set data recorded on the portable recording medium is equal to or less than a predetermined size and the object is recorded on the portable recording medium.4. The recording device according to claim 2 ,wherein the portable recording medium includes a reference partition and a data partition in which the object is recorded, andwherein the recording unit records the first set data and the second set data in the data partition, and in a case where a size of the second set data recorded in the data partition exceeds a predetermined size, records the second set data recorded in the data ...

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Номер записи: 68

04-01-2018 дата публикации

Method of manufacturing perpendicular magnetic recording head

Номер: US20180005648A1

Автор: Hisayoshi Watanabe, Ken Fujii, Masachika Hashino, Takamitsu Sakamoto, Tetsuya Hiraki

Принадлежит: TDK Corp

This method of manufacturing a perpendicular magnetic recording head includes: forming a water-soluble resin film on a base; forming a first resist pattern having an opening on the water-soluble resin film; selectively dissolving the water-soluble resin film exposed at a bottom of the opening with a developer to expose a part of a surface of the base; forming a non-magnetic oxide film to cover the opening and the exposed part of the surface of the base; forming a second resist pattern to fill the opening covered with the non-magnetic oxide film and then removing the first resist pattern and the non-magnetic oxide film; forming a first side shield and a second side shield on the base to allow them to face each other with the second resist pattern therebetween; and forming a magnetic pole between the first and the second side shields after removal of the second resist pattern.

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Номер записи: 69

02-01-2020 дата публикации

MAGNETIC TAPE APPARATUS

Номер: US20200005820A1

Автор: KASADA Norihito, Musha Atsushi, OZAWA Eiki

Принадлежит: FUJIFILM Corporation

A magnetic tape apparatus, in which a tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation by STEM is 0.85 to 1.00, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, and the deviation amount is determined in accordance with a result obtained by reading of the servo pattern included in the magnetic layer by a servo element. 1. A magnetic tape apparatus comprising:a magnetic tape;a reading element unit; andan extraction unit,wherein the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support,the magnetic layer includes a servo pattern,the ferromagnetic powder is a hexagonal ferrite powder,a tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00,the reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape,the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, andthe ...

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Номер записи: 70

02-01-2020 дата публикации

MAGNETIC TAPE APPARATUS

Номер: US20200005822A1

Автор: KASADA Norihito, Musha Atsushi, OZAWA Eiki

Принадлежит: FUJIFILM Corporation

A magnetic tape apparatus, in which an intensity ratio of peak intensity of diffraction peak of (110) plane with respect to peak intensity of diffraction peak of (114) plane of a hexagonal ferrite crystal structure obtained by XRD analysis of the magnetic layer by In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, and an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result. 1. A magnetic tape apparatus comprising:a magnetic tape;a reading element unit; andan extraction unit,wherein the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support,the magnetic layer includes a servo pattern,the ferromagnetic powder is a hexagonal ferrite powder,an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0,a vertical squareness ratio of the magnetic tape is 0.65 to 1.00,the reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape,the extraction unit performs a waveform equalization process according to a deviation amount between positions of ...

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Номер записи: 71

02-01-2020 дата публикации

MAGNETIC TAPE APPARATUS

Номер: US20200005827A1

Автор: KASADA Norihito, Musha Atsushi, OZAWA Eiki

Принадлежит: FUJIFILM Corporation

A magnetic tape apparatus includes a magnetic tape, a reading element unit and an extraction unit, in which a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.35, the reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, and the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result. 1. A magnetic tape apparatus comprising:a magnetic tape;a reading element unit; andan extraction unit,wherein the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support,a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.35,the reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, andthe extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.2. The magnetic tape apparatus according to claim 1 ,wherein parts of the plurality of reading elements are overlapped each other in a running direction of the magnetic tape.3. The magnetic tape apparatus according to claim 2 ,wherein the specific track region is a region including the reading ...

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Номер записи: 72

02-01-2020 дата публикации

MAGNETIC TAPE APPARATUS

Номер: US20200005828A1

Автор: KASADA Norihito, Musha Atsushi, OZAWA Eiki

Принадлежит: FUJIFILM Corporation

A magnetic tape apparatus, in which full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of a magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 15.0 nm, a difference between spacings measured by optical interferometry regarding the surface of the magnetic layer before and after performing the vacuum heating is greater than 0 nm and equal to or smaller than 12.0 nm, and the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result. 1. A magnetic tape apparatus comprising:a magnetic tape;a reading element unit; andan extraction unit,wherein the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder, a binding agent, and fatty acid ester on the non-magnetic support,a full width at half maximum of spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before performing a vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 15.0 nm,a full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 15.0 nm,{'sub': after', 'before', 'after', 'before, 'a difference S−Sbetween a spacing Smeasured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and a spacing Smeasured by optical interferometry regarding the surface of the magnetic layer before performing the vacuum heating with respect to ...

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Номер записи: 73

03-01-2019 дата публикации

MAGNETIC RECORDING MEDIUM PROCESSING DEVICE AND METHOD OF GENERATING INTERFERENCE FIELD

Номер: US20190005979A1

Автор: Higashi Katsuhisa, KURIBAYASHI Ikuro, MIYAZAWA Keiji, SHIMIZU Yohei

Принадлежит:

A magnetic recording medium processing device may include a magnetic recording medium insertion slot; a medium pathway connected to the magnetic recording medium insertion slot; a magnetic head arranged to face the medium pathway; and an interference magnetic field generating device structured to generate interference magnetic fields outside the magnetic recording medium insertion slot. The interference magnetic field generating device may include a coil, a capacitor, a first power line, a second power line to which a voltage different from that to the first power line is applied, multiple switches structured to switch the connections between the first power line and the second power line of the coil and the capacitor, and a switch control unit structured to control the multiple switches. 1. A magnetic recording medium processing device , comprising:a magnetic recording medium insertion slot;a medium pathway connected to said magnetic recording medium insertion slot;a magnetic head arranged to face said medium pathway; andan interference magnetic field generating device structured to generate interference magnetic fields outside said magnetic recording medium insertion slot; a coil,', 'a capacitor,', 'a first power line,, 'wherein said interference magnetic field generating device comprisesa second power line to which a voltage different from that to said first power line is applied, multiple switches structured to switch the connections between said first power line and said second power line of said coil and said capacitor, anda switch control unit structured to control said multiple switches to first implement a first interference magnetic field generating mode for which said coil and said capacitor are electrically connected in series between said first power line and said second power line and then to implement a second interference magnetic field generating mode for which said coil is oscillated by the charge stored in said capacitor during said first ...

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Номер записи: 74

20-01-2022 дата публикации

DISK DEVICE

Номер: US20220020391A1

Автор: Sonoda Koji

Принадлежит:

According to one embodiment, a disk device includes a housing, plurality of magnetic disks that are rotatable in the housing, magnetic heads which process data with respect to the respectively magnetic disks, a head actuator provided in the housing and supporting the magnetic heads to be movable and a capturing part formed of a material that is as easily or more easily electrostatically chargeable as or than a polycarbonate-based material in a triboelectric series, and disposed in the housing. 1. A disk device comprising:a housing;a magnetic disk that is rotatable in the housing;a magnetic head which processes data with respect to the magnetic disk;a head actuator provided in the housing and supporting the magnetic head to be movable; anda capturing part formed of a material that is as easily or more easily electrostatically chargeable as or than a polycarbonate-based material in a triboelectric series, and disposed in the housing.2. The disk device of claim 1 , further comprising:a regulator which applies a voltage of a reversed polarity to that of the capturing part to between the magnetic head and the magnetic disk.3. The disk device of claim 2 , whereina voltage applied to the magnetic head is 0.5 V or higher but 1 V or less.4. The disk device of claim 1 , wherein the capturing part is arranged in a position contactable with an air stream to occur by rotation of the magnetic disk.5. The disk device of claim 1 , wherein the capturing part is a filter comprising a case formed of the material and a moisture absorbent accommodated in the case.6. The disk device of claim 1 , wherein the capturing part is a spoiler formed of the material and disposed in a vicinity of an outer circumference of the magnetic disk.7. The disk device of claim 1 , whereinthe capturing part is a ramp formed of the material and disposed in a vicinity of an outer circumference of the magnetic disk.8. The disk device of claim 1 , whereinthe material is a synthetic resin which is easily ...

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Номер записи: 75

08-01-2015 дата публикации

MEDIUM, METHOD OF FABRICATING A MEDIUM, RECORDING SYSTEM AND METHOD OF CONTROLLING A RECORDING SYSTEM

Номер: US20150009785A1

Автор: LIU Bo, SHI Jianzhong, Yuan Zhimin, ZHOU Weidong

Принадлежит:

A medium may be provided. The medium includes a servo layer, a data recording layer, and a heat sink layer disposed between the servo layer and the recording layer. 110-. (canceled)11. A recording system , comprising:a first recording head and a second recording head;a medium comprising a data recording layer and a servo layer, wherein the data recording layer is arranged between the recording head and the servo layer;an external energy source;wherein the first recording head and the external energy source are configured to respectively provide a first magnetic field of a first magnetic field strength and external energy for writing on the data recording layer;wherein the second recording head is configured to provide a second magnetic field of a second magnetic field strength for writing on the servo layer;wherein the first magnetic field strength is weaker than the second magnetic field strength.12. The recording system of claim 11 ,wherein the external energy source comprises any one of a group consisting of laser, infrared heating, electrical Joule heating, and injection of hot air.13. The recording system of claim 11 ,wherein the second recording head has a larger dimension than the first recording head.14. The recording system of claim 11 ,wherein the second recording head is configured to write servo information on the servo layer using a shingled writing scheme.15. The recording system of claim 14 ,wherein the second recording head is configured to provide the second magnetic field of the second magnetic field strength for writing on the servo layer.16. The recording system of claim 11 ,wherein the second recording head is configured to write servo information on the servo layer using an energy assisted magnetic recording scheme.17. The recording system of claim 16 ,wherein the second recording head and the external energy source are configured to respectively provide the second magnetic field of the second magnetic field strength and the external energy for ...

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Номер записи: 76

08-01-2015 дата публикации

Variable bit aspect ratios in magnetic media

Номер: US20150009787A1

Автор: Edward Charles Gage, Tim Rausch

Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus comprises a write transducer, an energy source, and a controller. The write transducer is configured to write data to a magnetic recording medium, and the energy source is configured to heat the magnetic recording medium while it is being written to by the write transducer. The controller is coupled to the write transducer and configured to adjust at least an operating power of the energy source to selectably cause bits having variable bit aspect ratios to be written to the magnetic media.

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Номер записи: 77

12-01-2017 дата публикации

Magnetic tape media having servo patterns

Номер: US20170011762A1

Автор: Robert G. Biskeborn, Wayne I. Imaino

Принадлежит: International Business Machines Corp

Magnetic tape media according to one embodiment includes a plurality of servo tracks having physical characteristics of being written by an apparatus that monitors a lateral position of the magnetic tape media passing over a servo writing head during a servo track writing operation and writes servo marks to the magnetic tape media. A timing of the writing of each servo mark is based on the monitored position of the magnetic tape media.

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Номер записи: 78

14-01-2016 дата публикации

Reduced friction retention of a data storage cartridge within a storage cell

Номер: US20160012830A1

Автор: Andrew S. Green, Dylan J. Boday, Shawn M. Nave

Принадлежит: International Business Machines Corp

Described are embodiments of an invention for a textured interface between a notch of a data storage cartridge and a retention tab of a storage cell. The textured surface reduces the contact surface between the retention tab and the notch of the data storage cartridge. The reduced contact surface between the retention tab and notch of the data storage cartridge reduces the amount of friction between the retention tab and the notch of the data storage cartridge. The data storage cartridge can thus be removed from the storage cell with less force than that required by the prior art having a generally smooth interface between the notch of the data storage cartridge and the retention tab of the storage cell.

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Номер записи: 79

14-01-2016 дата публикации

MAGNETIC HEAD AND SYSTEM HAVING OFFSET ARRAYS

Номер: US20160012840A1

Автор: Biskeborn Robert G., Herget Philipp, Lo Calvin S.

Принадлежит: INTERNATIONAL BUSINESS MACHINES CORPORATION

A computer program product for orienting a head includes a computer readable storage medium having program instructions embodied therewith. The program instructions are readable and/or executable by a controller to cause the controller to: determine a desired pitch for transducers for reading and/or writing to a magnetic tape; and cause a mechanism to orient a head to achieve the desired pitch. The array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that the transducers of the first module are about aligned with the transducers of the second module in the intended direction of tape travel thereacross when the axes are oriented at an angle greater than 0.2° relative to a line oriented perpendicular to the intended direction of tape travel. 1. A computer program product for orienting a head , the computer program product comprising a computer readable storage medium having program instructions embodied therewith , the program instructions readable and/or executable by a controller to cause the controller to:determine, by the controller, a desired pitch for transducers for reading and/or writing to a magnetic tape; andcause, by the controller, a mechanism to orient a head to achieve the desired pitch, the head having at least two opposing modules generally aligned with each other in an intended direction of tape travel thereacross, positions of the two modules being fixed relative to each other, each module having an array of the transducers, wherein an axis of each array is defined between opposite ends thereof, wherein the array of a first of the modules is offset from the array of a second of the modules in a first direction parallel to the axis of the array of the second module such that the transducers of the first module are about aligned with the transducers of the second module in the intended direction of tape travel thereacross when the axes are ...

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Номер записи: 80

14-01-2016 дата публикации

SERIAL PORT COMMUNICATION FOR STORAGE DEVICE USING SINGLE BIDIRECTIONAL SERIAL DATA LINE

Номер: US20160012846A1

Автор: Dolan Daniel J., Kelly David W., Rauschmayer Richard, Wilson Ross S.

Принадлежит:

A method is provided to enable communication between a controller and a preamplifier in a storage device. For example, the method includes implementing a serial port which is configured to transmit digital signals between the controller and the preamplifier over a single bidirectional serial data line. The serial port is controlled to selectively transmit digital signals over the bidirectional serial data line in either a first direction from the controller to the preamplifier or a second direction from the preamplifier to the controller. 1. A method to provide communication between a controller and a preamplifier in a storage device , comprising:implementing a serial port that is configured to transmit digital signals between the controller and the preamplifier over a single bidirectional serial data line; andcontrolling the serial port to selectively transmit digital signals over the bidirectional serial data line in either a first direction from the controller to the preamplifier or a second direction from the preamplifier to the controller.2. The method of claim 1 , wherein controlling the serial port comprises:transmitting a serial bit stream over the bidirectional serial data line from the controller to the preamplifier;generating a clock signal in the preamplifier using a phase-locked loop circuit, wherein the clock signal is generated based on a bit rate of the serial bit stream received by the preamplifier; andusing the clock signal to receive and deserialize the serial bit stream received by the preamplifier.3. The method of claim 2 , wherein controlling the serial port further comprises:transmitting a direction switch control signal over the bidirectional serial data line to the preamplifier; and generating a control signal to suspend phase and frequency adjustments of the phase-locked loop circuit of the preamplifier and maintain a static clock signal output from the phase-locked loop circuit of the preamplifier;', 'assuming control of the bidirectional ...

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Номер записи: 81

11-01-2018 дата публикации

MANAGING FAR AND NEAR TRACK ERASURE BY DYNAMIC CONTROL OF A WRITE CURRENT PARAMETER OF A MAGNETIC DISK DRIVE

Номер: US20180012627A1

Автор: Burkhardt Mark Hutcheson, Chembrolu Venkatesh, Chen Zhaohui, Lam Quan-Chiu, Narayana Supradeep

Принадлежит:

A method may include causing a write head of a magnetic data storage drive to write a first portion of data to a magnetic data storage device of the magnetic data storage drive based at least in part on a first value of at least one parameter of a write current. The method may include updating a value of a write counter and determining whether the value of the write counter is greater than or equal to a threshold write count. The method may also include adjusting the at least one parameter of the write current to a second, different value. The method may further include causing the write head to write a second portion of data to the magnetic data storage device based at least in part on the second value of the at least one parameter of the write current. 1. A method comprising:causing, by a controller of a magnetic data storage drive, a write head of the magnetic data storage drive to write a first portion of data to a magnetic data storage device of the magnetic data storage drive based at least in part on a first value of at least one parameter of a write current;in response to writing the first portion, updating, by the controller, a value of a write counter;determining, by the controller, whether the value of the write counter is greater than or equal to a threshold write count;in response to determining that the value of the write counter is greater than or equal the threshold write count, adjusting, by the controller, the at least one parameter of the write current to a second, different value; andcausing, by the controller, the write head to write a second portion of data to the magnetic data storage device based at least in part on the second value of the at least one parameter of the write current.2. The method of claim 1 , wherein adjusting the at least one parameter of the write current to the second claim 1 , different value comprises adjusting claim 1 , by the controller claim 1 , a rise time from a first duration to a second claim 1 , different ...

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Номер записи: 82

10-01-2019 дата публикации

MAGNETIC RECORDING AND REPRODUCING DEVICE

Номер: US20190013042A1

Автор: Isowaki Yousuke, MAEDA Tomoyuki, NARITA Naoyuki, Sugawara Katsuya, TAKAGISHI Masayuki

Принадлежит: KABUSHIKI KAISHA TOSHIBA

According to one embodiment, a magnetic recording and reproducing device includes an output driver, a magnetic head, and a magnetic recording medium. The output driver outputs a recording signal corresponding to input information. The magnetic head includes a coil. A recording current includes the recording signal flows in the coil. Information corresponding to the input information is recorded in the magnetic recording medium. The input information includes first, second, and third information combinations. The first information combination includes first to fourth information. The second information combination includes fifth to eighth information. The third information combination includes ninth to twelfth information. The recording signal changes to an eleventh recording current to correspond to the eleventh information. The recording signal changes to a third recording current to correspond to the third information. An absolute value of the eleventh recording current is greater than an absolute value of the third recording current. 1. A magnetic recording and reproducing device , comprising:an output driver outputting a recording signal corresponding to input information;a magnetic head including a coil, a recording current flowing in the coil, the recording current including the recording signal; anda magnetic recording medium, information being recorded in the magnetic recording medium by the magnetic head, the information corresponding to the input information,the input information including a first information combination, a second information combination, and a third information combination,the first information combination including first to fourth information,the second information being after the first information and being continuous with the first information,the third information being after the second information and being continuous with the second information,the fourth information being after the third information and being continuous with the ...

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Номер записи: 83

10-01-2019 дата публикации

DETERMINING BIT ASPECT RATIOS FOR PARTIALLY-OVERLAPPING MAGNETIC RECORDING TRACKS

Номер: US20190013045A1

Автор: Kan Utt Heng, Lau Luh Chyuan, Lee Meng Suan June, Lim Lin Nah, Seng Edmun Chian Song, Toribio Jose Mari Corral, Wu Det Hau

Принадлежит:

A method involves determining bit aspect ratios for interlaced tracks written to a magnetic recording medium. The interlaced tracks include top tracks that are written partially overlapping with bottom tracks. Isolated test tracks are written at first different bit aspect ratios to determine a top bit aspect ratio that achieves a first target areal density for the isolated test tracks. Test tracks are written at second different bit aspect ratios to determine a bottom bit aspect ratio that achieves a second target areal density for the test tracks. Top test tracks of the test tracks are written at the top bit aspect ratio. The top and bottom bit aspect ratios are selected to subsequently write partially-overlapping tracks on the magnetic recording medium. 1. A method , comprising:writing isolated test tracks to determine a first areal density function for top tracks of a magnetic recording medium, the first areal density function based on write-plus-erase track widths obtained using different first laser powers and first linear bit densities that achieve a first target bit error rate for the isolated test tracks;{'sub': top', 'top, 'selecting a value LDIof the first laser powers and a value BPIof the first linear bit densities that result in a first target value of the areal density function;'}{'sub': top', 'top, 'writing partially-overlapping test tracks to determine a second areal density function of bottom tracks based on squeezed track widths written using different second laser powers and second linear bit densities that achieve a second target bit error rate for bottom test tracks of the partially-overlapping test tracks, top test tracks of the partially-overlapping test tracks being written at LDIand BPI; and'}{'sub': bottom', 'bottom', 'top', 'top', 'bottom', 'bottom, 'selecting a value LDIof the second laser powers and a value BPIof the second linear bit densities that result in a second target value of the second areal density function, the LDI, BPI, LDI, ...

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Номер записи: 84

14-01-2021 дата публикации

HARD DISK DRIVE

Номер: US20210012796A1

Автор: Chen Yu, MIYAMOTO Koichiro, Oozeki Kenichiro

Принадлежит:

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 ...

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Номер записи: 85

14-01-2021 дата публикации

CARTRIDGE MEMORY, RECORDING MEDIUM CARTRIDGE, AND METHOD OF PRODUCING THE SAME

Номер: US20210012804A1

Автор: Abe Masayoshi, Adachi Naohiro, ANNO Kazuo, IWAMA Takanobu, NAKASHIO Eiji, TOCHIKUBO Shinya, YAMAGA Minoru

Принадлежит:

[Object] A cartridge memory according to an embodiment of the present technology is a cartridge memory for a recording medium cartridge, including: a memory unit; and a capacity setting unit. The memory unit has a memory capacity capable of storing management information relating to a second information recording medium configured to be capable of recording information with a second data track number larger than a first data track number. The capacity setting unit is configured to be capable of setting a data storage area limited to a first capacity capable of storing management information relating to a first information recording medium configured to be capable of recording information with the first data track number. 1. A cartridge memory for a recording medium cartridge , comprising:a memory unit that has a memory capacity capable of storing management information relating to a second information recording medium configured to be capable of recording information with a second data track number larger than a first data track number; anda capacity setting unit configured to be capable of setting, to the memory unit, a data storage area limited to a first capacity capable of storing management information relating to a first information recording medium configured to be capable of recording information with the first data track number.2. The cartridge memory according to claim 1 , whereinthe capacity setting unit is configured to be capable of expanding the data storage area limited to the first capacity to a second capacity capable of storing management information relating to the second information recording medium.3. The cartridge memory according to claim 1 , whereinthe memory unit has a memory capacity of not less than 32 kilobytes, andthe capacity setting unit sets a data storage area having the first capacity of not more than 16 kilobytes to the memory unit.4. The cartridge memory according to claim 1 , further comprisinga voltage generation unit that ...

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Номер записи: 86

14-01-2021 дата публикации

MAGNETIC RECORDING MEDIUM AND CARTRIDGE

Номер: US20210012805A1

Автор: IWAMA Takanobu, Takahashi Jun, TERAKAWA Masaru, YAMAGA Minoru

Принадлежит:

[Object] Provided is a technology that is capable of further improving a recording density of data. 1. A magnetic recording medium in a shape of a tape that is long in a longitudinal direction and is short in a width direction , the medium comprising:a base material;a magnetic layer; anda non-magnetic layer that is provided between the base material and the magnetic layer, and contains one or more types of non-magnetic inorganic particles, whereinthe magnetic layer includes a data band long in the longitudinal direction in which a data signal is to be written, and a servo band long in the longitudinal direction in which a servo signal is written, and in the magnetic layer, a degree of vertical orientation is greater than or equal to 65%, a half width of a solitary waveform in a reproduction waveform of the servo signal is less than or equal to 195 nm, and a thickness of the magnetic layer is less than or equal to 90 nm, and{'sup': −5', '3, 'the non-magnetic layer contains at least Fe-based non-magnetic particles as the non-magnetic inorganic particles, and in the non-magnetic layer, an average particle volume of the Fe-based non-magnetic particles is less than or equal to 2.0×10μm, and a thickness of the non-magnetic layer is less than or equal to 1.1 μm.'}2. The magnetic recording medium according to claim 1 , wherein{'sup': −5', '3, 'the average particle volume of the Fe-based non-magnetic particles is less than or equal to 1.0×10μm.'}3. The magnetic recording medium according to claim 1 , whereinthe half width of the solitary waveform is less than or equal to 180 nm.4. The magnetic recording medium according to claim 3 , whereinthe half width of the solitary waveform is less than or equal to 160 nm.5. The magnetic recording medium according to claim 4 , whereinthe half width of the solitary waveform is less than or equal to 140 nm.6. The magnetic recording medium according to claim 5 , whereinthe half width of the solitary waveform is less than or equal to 120 nm ...

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Номер записи: 87

09-01-2020 дата публикации

DUAL ACTUATOR STORAGE DEVICE UTILIZING MULTIPLE DISK ZONES

Номер: US20200013430A1

Автор: Haapala Kenneth, Trantham Jon D., Zhu Wenzhong

Принадлежит:

A recording surface of a magnetic disk is divided into first and second zones. A first head of a first actuator arm assembly reads from and/or writes to the first zone exclusively. A second head of a second actuator arm assembly reads from and/or writes to the second zone exclusively. The first and second head are capable of simultaneously reading from and writing to the recording surface. 1. An apparatus , comprising:a first actuator assembly comprising a first head configured to write to a recording surface of a magnetic disk, the first actuator assembly rotating about a first axis;a second actuator assembly comprising a second head configured to write to the recording surface simultaneously with the first head, the first actuator assembly rotating about a second axis separate from the first axis; and divide the recording surface into first and second zones that comprise respective inner and outer annuli of the recording surface; and', 'cause the first and second heads to write exclusively to the first and second zones respectively, wherein the first head and the second head are optimized for reduced skew angles in the inner and outer annuli., 'a controller coupled to the first and second actuator assemblies, the controller configured to2. The apparatus of ; wherein the outer annuli and second head are configured for high data rate/low areal density and the inner annuli and first head are configured for low data rate/high areal density.3. The apparatus of claim 1 , wherein a first bit-aspect ratio that is optimal for the first head is used to write to the first zone claim 1 , and where a second bit-aspect ratio that is optimal for the second head is used to write to the second zone claim 1 , the first bit-aspect ratio being different than the first bit-aspect ratio.4. The apparatus of claim 1 , wherein the first and second heads can both read from e first and second zones.5. The apparatus of claim 1 , wherein the first and second heads can read from the recording ...

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Номер записи: 88

15-01-2015 дата публикации

Optimum tape layout selection for improved error correction capability

Номер: US20150015982A1

Автор: Robert A. Hutchins, Roy D. Cideciyan, Thomas Mittelholzer

Принадлежит: International Business Machines Corp

According to one embodiment, a system for selecting an optimum tape layout to store data on a tape medium may include a processor and logic integrated with and/or executable by the processor, the logic being configured to: select a family of data set layouts based on parameters associated with at least a tape drive and the tape medium, compute a set of all minimum distances for the selected family of data set layouts, calculate a first performance metric associated with each possible set of parameters, select a best first performance metric from all calculated first performance metrics and store a set of parameters associated with the best first performance metric, and select a data set layout algorithm which utilizes the set of parameters associated with the best first performance metric, wherein the data set layout algorithm and a rewrite layout algorithm combine to form an optimum tape layout.

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Номер записи: 89

15-01-2015 дата публикации

Storage Media Inter-Track interference Cancellation

Номер: US20150015984A1

Автор: Forham Carl E., Haratsch Erich F., Jin Ming, Lund Timothy B., Mathew George, Park Jongseung, Swatosh Timothy W.

Принадлежит: LSI Corporation

Described embodiments provide a method of cancelling inter-track interference (ITI) from one or more sectors read from a desired track of a storage medium. A read channel reads sectors in a desired track of the storage medium. A decoder of the read channel decodes the read sectors, and if the read sectors are incorrectly recovered from the storage medium, selected sectors of a first adjacent track and a second adjacent track are read. An ITI canceller of the read channel estimates ITI in the read sectors of the desired track corresponding to the selected sectors of each adjacent track and subtracts the estimated ITI of each adjacent track from the data for the sectors of the desired track, providing updated sector data. The ITI cancelled data is replayed to the decoder, Which decodes the ITT cancelled data and provides the decoded ITI cancelled data as output of the read channel. 1. A storage media controller for cancelling inter-track interference (ITI) in one or more sectors read from a desired track of a storage medium , the media controller comprising:a read channel configured to read one or more sectors in a desired track of the storage medium;an iterative decoder circuit operable to apply a data decoding algorithm to one or more read sectors derived from a desired track of the storage medium to yield a decoded output; the read channel is configured to read selected sectors of a first adjacent track and a second adjacent track;', 'an ITI canceller of the read channel configured to (i) estimate ITI in the one or more read sectors of the desired track corresponding to the selected sectors of the first adjacent track and the second adjacent track, (ii) subtract the estimated ITI of the first adjacent track and the second adjacent track from the data for the one or more sectors of the desired track to provide updated sector data, and (iii) replay the ITI cancelled data to the iterative decoder;', 'the iterative decoder circuit is configured to (i) decode the ITI ...

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Номер записи: 90

17-04-2014 дата публикации

Method of manufacturing a printed circuit board assembly sheet

Номер: US20140101934A1

Автор: Jun Ishii, Naohiro Terada, Terukazu Ihara

Принадлежит: Nitto Denko Corp

A dummy trace portion is provided in a region between at least a suspension board with circuit on one end side and a support frame of a suspension board assembly sheet with circuits. A base insulating layer is formed on a support substrate in the dummy trace portion. A plurality of conductor traces are formed on the base insulating layer, and a cover insulating layer is formed on the base insulating layer to cover each conductor trace. At least one of the base insulating layer and the cover insulating layer in the dummy trace portion has a groove.

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Номер записи: 91

19-01-2017 дата публикации

LOGICAL BLOCK PROTECTION FOR TAPE INTERCHANGE

Номер: US20170017541A1

Автор: Nemeth Joseph Carl, Rehm Kevan Flint, Schmitz Judith Ann, Sygulla John Michael

Принадлежит:

A two part process is used for modifying records to be written and retrieved from tape devices. A record is appended with a cyclic redundancy check and a string of zeros. Submitting the entire record to tape drives which are logical block protection enabled will result in no change. For drives that are not LBP enabled, the string of zeros at the end of the record is removed. In addition to determining whether a drive is LBP compliant, a determination may be made as to whether a drive is a linear tape open drive from a particular manufacturer. Linear tape open drives may behave similarly as drives which may not be enabled with logical block protection. 1. (canceled)2. A method for storing data on tape media , the method comprising:identifying that a first tape drive supports logical block protection (LBP), wherein a first tape media resides at the first tape drive;issuing a read command to the first tape drive to read a first record stored at the first tape media;receiving the first data record and data associated with the first record stored at the first tape media, wherein the data associated with the first record stored at the first tape media includes a field of zeros associated with the first record;receiving updated data to write to the first record at the first tape media;appending a field of zeros to the updated data that are associated with the updated data;issuing a write command to the first tape drive to write updated data with the appended field of zeros to the first data record stored at the first tape media, andsending the updated data with the appended field of zeros to the first tape drive, wherein the first tape drive writes the updated data with the appended field of zeros to the first data record at the first tape media.3. The method of claim 2 , wherein the data read from the first data record also has cyclic redundancy check (CRC) bytes appended to the first data record claim 2 , and the method further comprising:stripping the CRC bytes from the ...

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Номер записи: 92

21-01-2016 дата публикации

CURRENT-PERPENDICULAR-TO-PLANE MAGNETO-RESISTANCE EFFECT ELEMENT

Номер: US20160019917A1

Автор: DU Ye, FURUBAYASHI Takao, HONO Kazuhiro, TAKAHASHI Yukiko

Принадлежит: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

The CPPGMR element of the present invention has an orientation layer formed on a substrate to texture a Heusler alloy into a (100) direction, an underlying layer that is an electrode for magneto-resistance measurement stacked on the orientation layer , a lower ferromagnetic layer and an upper ferromagnetic layer each stacked on the underlying layer and made of a Heusler alloy, a spacer layer sandwiched between the lower ferromagnetic layers and the upper ferromagnetic layers , and a cap layer stacked on the upper ferromagnetic layer for surface-protection. This manner makes it possible to provide, inexpensively, an element using a current-perpendicular-to-plane giant magneto-resistance effect (CPPGMR) of a thin film having a trilayered structure of a ferromagnetic metal/a nonmagnetic metal/a ferromagnetic metal, thereby showing excellent performances.

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Номер записи: 93

21-01-2016 дата публикации

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

Номер: US20160019923A1

Автор: Anaya-Dufresne Manuel Charles, Karr Brian William, Kunkel Gary Joseph, Wei Zhen

Принадлежит:

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

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Номер записи: 94

21-01-2016 дата публикации

Constraining fir filter taps in an adaptive architecture

Номер: US20160019929A1

Автор: Robert A. Hutchins

Принадлежит: International Business Machines Corp

According to one embodiment, a system for processing data includes a processor and logic integrated with and/or executable by the processor, the logic being configured to individually set, for each of one or more range-constrained finite impulse response (FIR) filter taps configured for use in a FIR filter, a predetermined range of values suitable for controlling an equalizer response, and pass data through the equalizer including the FIR filter to obtain equalized data, wherein each of the one or more range-constrained FIR filter taps are individually adaptive within its predetermined range of values. Other systems and methods for processing data by constraining FIR filter taps while reading data from a data storage medium are described in more embodiments.

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Номер записи: 95

21-01-2016 дата публикации

DYNAMIC GAIN CONTROL FOR USE WITH ADAPTIVE EQUALIZERS

Номер: US20160019930A1

Автор: Blinick Katherine T., Hutchins Robert A., Oelcer Sedat

Принадлежит:

According to one embodiment, a system for processing data includes a controller configured to: receive data read from a magnetic storage medium, apply a finite impulse response (FIR) filter to the data to obtain equalized data, and direct the equalized data through either a first FIR gain module or a second FIR gain module to control FIR gain of the equalized data, wherein the first FIR gain module is utilized when reading data in an asynchronous mode, and wherein the second FIR gain module is utilized when reading data in a synchronous mode and a FIR gain value of the second FIR gain module is automatically controlled. Other systems and methods for processing data using dynamic gain control with adaptive equalizers are presented according to more embodiments. 1. A system for processing data , the system comprising a controller configured to:receive data read from a magnetic storage medium;apply a finite impulse response (FIR) filter to the data to obtain equalized data; anddirect the equalized data through either a first FIR gain module or a second FIR gain module to control FIR gain of the equalized data,wherein the first FIR gain module is utilized when reading data in an asynchronous mode, andwherein the second FIR gain module is utilized when reading data in a synchronous mode and a FIR gain value of the second FIR gain module is automatically controlled.2. The system as recited in claim 1 , wherein the controller is further configured to automatically control the FIR gain value in the second FIR gain module using an automated FIR gain control module based on a FIR output from the equalizer and variations in an amplitude of a waveform of the data.3. The system as recited in claim 2 , wherein the automated FIR gain control module comprises logic configured to:receive the FIR output from the equalizer;select at least one error source from a plurality of error sources available to the automated FIR gain control module;calculate the FIR gain value based on error ...

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Номер записи: 96

18-01-2018 дата публикации

MULTI-GEN DRIVES

Номер: US20180018992A1

Автор: Starr Matthew Thomas

Принадлежит:

Described is a tape library system that generally comprises a plurality of tape drives and a data bus that links a host computer system to a first tape drive address and a second tape drive address. However, the first tape drive address points to a first controller and switch system that assumes the identity of one of the tape drives. The first controller and switch system is linked to a first tape drive adapted to cooperate with a first type of tape cartridge and a second tape drive adapted to cooperate with second type of tape cartridge. The second tape drive address points to a second controller and switch system that assumes the identity of a different one of the tape drives. The second controller and switch system is linked to a third tape drive adapted to cooperate with the first type of tape cartridge and a third tape drive adapted to cooperate with the second type of tape cartridge. 1. A tape library system comprising:a plurality of tape drives;a data bus that links a host computer system to a first tape drive address and a second tape drive address;the first tape drive address points to a first controller and switch system;the first controller and switch system is linked to a first tape drive adapted to cooperate with a first type of tape cartridge and a second tape drive adapted to cooperate with second type of tape cartridge.2. The tape library system of further comprising a second tape drive address claim 1 , the second tape drive address points to a second controller and switch system;the second controller and switch system is linked to a third tape drive adapted to cooperate with the first type of tape cartridge and a third tape drive adapted to cooperate with the second type of tape cartridge; andthe first tape drive address and the second tape drive address adapted to appear to the host computer system as a target tape drive.3. The tape library system of wherein the first tape drive is a first generation tape drive adapted to cooperate with a first ...

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Номер записи: 97

18-01-2018 дата публикации

METHOD AND APPARATUS FOR JOINT ADAPTATION OF TWO-/MULTI- DIMENSIONAL EQUALIZER AND PARTIAL RESPONSE TARGET

Номер: US20180018997A1

Автор: Dey Arnab, Garani Shayan Srinivasa, Matcha Chaitanya Kumar

Принадлежит:

The present disclosure relates to a method and apparatus for processing of multi-dimensional readback signal from magnetic recording or optical, physical data recording so as to reduce/control Inter Symbol Interference (ISI) and noise within acceptable limits. The method is based on Partial Response Maximum Likelihood (PRML) detection and takes care of time varying channel conditions. In an embodiment, the filter coefficients of both the equalizer and the partial response (PR) target are jointly adapted to account for the channel condition for both separable and non-separable targets thus reducing signal detection complexity. In an aspect, the disclosure provides an apparatus that incorporates an adaptation engine along with the equalizer and the PR target that updates filter coefficients of both the equalizer and the PR target following the formulated mathematical equations. 1. A method for processing of multi-dimensional readback signal to reduce Inter Symbol Interference (ISI) and noise , said method comprising the step of:equalizing the readback signal using a linear equalizer that adapts to varying channel conditions; anddesigning a Partial Response (PR) target for signal detection based on Partial Response Maximum Likelihood (PRML) and the equalizer output, wherein the equalizer and the PR target are jointly adapted.2. The method of claim 1 , wherein the step of equalizing enables handling of channel conditions accounting for one or more time varying factors selected from any or a combination of wear and tear claim 1 , media and temperature variations.3. The method of claim 1 , wherein one or more filter coefficients for the linear equalizer and the PR target are jointly adapted to account for channel condition to help mitigate effects of SNR variations along with ISI reduction/control.4. The method of claim 3 , wherein output of the equalizer is compared with target response to obtain an error that is used to update the one or more filter coefficients.5. The ...

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Номер записи: 98

17-04-2014 дата публикации

HIGH-RATE REVESE-ORDER RUN-LENGTH-LIMITED CODE

Номер: US20140104714A1

Автор: BARNDT Richard, JEONG Kuhong, KARABED Razmik, OZDEMIR Hakan C.

Принадлежит: STMicroelectronics, Inc.

A system and method for encoding a stream of bits with a run-length limited high-rate reverse order encoding schema. According to one embodiment, an RLL encoding block includes a receiver having a precoder operable to receive a stream of N-bits having symbols of M-bits in length, a histogram operable to identify an index symbol of M-bits that does not occur within the received stream of N-bits. It is this index symbol that may be used as the key to encoding a block of symbols so as to ensure unique decodability when RLL decoding. Finally, an encoder operable to perform an exclusive-or operation on each symbol with the next symbol stored in the stream. Such an encoding system only adds one symbol of M bits in length to a block of N bits and still results in a stream of bits sufficient to support high-rate requirements and strict timing loop control. 116-. (canceled)17. A computer system; comprising:a processor;a system bus coupled to the processor and configured to facilitate the transfer of data in the form of a stream of bits;a read/write channel coupled to the system bus, the read/write channel further comprising: a write-channel buffer configured to receive a stream of bits to be sent to a write channel;', 'a write-channel RLL-block configured to determine a unique sequence of bits that is not present in the stream of bits and configured to combine the unique sequence of bits with the stream of bits., 'a write channel, having18. The computer system of further comprising a memory coupled to the system bus.19. The computer system of wherein the read/write channel comprises part of a hard-disk drive system having a hard disk memory configured to be written to via the write channel.20. The computer system of wherein the read/write channel comprises part of a communication channel having a transmitter configured to transmit the stream of bits over a communication channel.21. A method for encoding a stream of bits claim 17 , the method comprising:receiving a stream of ...

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Номер записи: 99

21-01-2021 дата публикации

USE OF ERROR CORRECTION CODES TO PREVENT ERRORS IN NEIGHBORING STORAGE

Номер: US20210019226A1

Автор: Hassan Amer Aref, Kuntz Roy D., Lickorish David Anthony

Принадлежит:

Disclosed in some examples are methods, systems, storage devices, and machine readable mediums that utilize the ability of ECC to correct errors to actively prevent errors. The memory device determines whether a request to place data of a requested value at a requested location in the storage media is likely to interfere with other data stored at other locations on the storage media, and if so, changes the requested value to a second value that will not interfere (or has a lower probability of interfering) with neighboring data. The second value may be corrected to the requested value when a read request is made for that data using ECC. 1. A method for storing data , the method comprising:receiving a proposed data value for storage at a target location on a data storage device, proposed data value having an error correction code applied; determining, based upon the proposed data value and a non-target data value stored in a non-target location on the data storage device, that writing of the proposed data value to the target location has a first probability that exceeds a threshold probability of changing the non-target data value stored at the non-target location on the data storage device or changing a second non-target data value at a second non-target location;', 'selecting a second data value that has a second probability of causing interference with the non-target data value stored at the non-target location or the second non-target data value at the second non-target location, the second probability less than the first probability, the second data value selected based upon the proposed data value and the non-target data value stored at the non-target location; and', 'changing the proposed data value to the second data value; and, 'prior to writing the proposed data value at the target locationwriting the second data value to the data storage device at the target location.2. The method of claim 1 , wherein the data storage device is a magnetic storage device.3. ...

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Номер записи: 100