JP5840546B2 - ストレージデバイスにおける制御されたウェッジスペーシングのためのシステム及び方法 - Google Patents

ストレージデバイスにおける制御されたウェッジスペーシングのためのシステム及び方法 Download PDF

Info

Publication number
JP5840546B2
JP5840546B2 JP2012068651A JP2012068651A JP5840546B2 JP 5840546 B2 JP5840546 B2 JP 5840546B2 JP 2012068651 A JP2012068651 A JP 2012068651A JP 2012068651 A JP2012068651 A JP 2012068651A JP 5840546 B2 JP5840546 B2 JP 5840546B2
Authority
JP
Japan
Prior art keywords
clock
phase
data
domain
servo
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2012068651A
Other languages
English (en)
Japanese (ja)
Other versions
JP2013069398A5 (enExample
JP2013069398A (ja
Inventor
ピー．グランドヴィグ ジェフリー
ピー．グランドヴィグ ジェフリー
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LSI Corp
Original Assignee
LSI Logic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LSI Logic Corp filed Critical LSI Logic Corp
Publication of JP2013069398A publication Critical patent/JP2013069398A/ja
Publication of JP2013069398A5 publication Critical patent/JP2013069398A5/ja
Application granted granted Critical
Publication of JP5840546B2 publication Critical patent/JP5840546B2/ja
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10222—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
    • G11B5/59633—Servo formatting
    • G11B5/5965—Embedded servo format

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
JP2012068651A 2011-09-23 2012-03-26 ストレージデバイスにおける制御されたウェッジスペーシングのためのシステム及び方法 Expired - Fee Related JP5840546B2 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/242,983 US8780476B2 (en) 2011-09-23 2011-09-23 Systems and methods for controlled wedge spacing in a storage device
US13/242,983 2011-09-23

Publications (3)

Publication Number Publication Date
JP2013069398A JP2013069398A (ja) 2013-04-18
JP2013069398A5 JP2013069398A5 (enExample) 2015-04-02
JP5840546B2 true JP5840546B2 (ja) 2016-01-06

Family

ID=47076049

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2012068651A Expired - Fee Related JP5840546B2 (ja) 2011-09-23 2012-03-26 ストレージデバイスにおける制御されたウェッジスペーシングのためのシステム及び方法

Country Status (6)

Country Link
US (1) US8780476B2 (enExample)
EP (1) EP2573771A3 (enExample)
JP (1) JP5840546B2 (enExample)
KR (1) KR20130032820A (enExample)
CN (1) CN103021436B (enExample)
TW (1) TW201329963A (enExample)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9280995B2 (en) * 2014-03-28 2016-03-08 Avago Technologies General Ip (Singapore) Pte. Ltd. Locking a disk-locked clock using timestamps of successive servo address marks in a spiral servo track
US8879186B1 (en) * 2014-08-19 2014-11-04 Avago Technologies General Ip (Singapore) Pte. Ltd. Fast flaw scan for multiple sensor systems
US9749125B2 (en) * 2014-12-12 2017-08-29 Analog Devices Global Apparatus and method for clock generation

Family Cites Families (150)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973182A (en) 1971-08-20 1976-08-03 Agency Of Industrial Science & Technology Method and apparatus for detecting uneven magnetic field by hall effect in semiconductor
US3973183A (en) 1971-08-20 1976-08-03 Agency Of Industrial Science & Technology Method and apparatus for detecting uneven magnetic field by a change in resistance of semiconductor element
US4024571A (en) 1975-08-14 1977-05-17 Rca Corporation Synchronizing system employing burst crossover detection
US4777544A (en) 1986-08-15 1988-10-11 International Business Machine Corporation Method and apparatus for in-situ measurement of head/recording medium clearance
DE3938520A1 (de) 1989-11-21 1991-05-29 Teves Gmbh Alfred Verfahren und system zur messdatenerfassung und -auswertung
US5130866A (en) 1990-07-17 1992-07-14 International Business Machines Corporation Method and circuitry for in-situ measurement of transducer/recording medium clearance and transducer magnetic instability
JPH0528659A (ja) * 1991-05-16 1993-02-05 Olympus Optical Co Ltd デイジタル信号再生装置
US5278703A (en) 1991-06-21 1994-01-11 Digital Equipment Corp. Embedded servo banded format for magnetic disks for use with a data processing system
US5309357A (en) 1992-01-28 1994-05-03 Independent Scintillation Imaging Systems (Isis) Inc. Scintillation data collecting apparatus and method
US5341249A (en) 1992-08-27 1994-08-23 Quantum Corporation Disk drive using PRML class IV sampling data detection with digital adaptive equalization
US5377058A (en) 1992-12-31 1994-12-27 International Business Machines Corporation Fly height servo control of read/write head suspension
JPH0795056A (ja) * 1993-05-10 1995-04-07 Internatl Business Mach Corp <Ibm> 可変周波数基準クロック生成装置
US5400201A (en) 1993-10-25 1995-03-21 Syquest Technology, Inc. Servo burst pattern for removing offset caused by magnetic distortion and method associated therewith
JPH07302938A (ja) 1994-04-28 1995-11-14 Sony Corp 圧電セラミックトランス及びその製造方法
US5798885A (en) 1994-06-06 1998-08-25 Fujitsu Limited Head positioning control for disk apparatus using peak detection, polarity detection and sector mark detection
US5594341A (en) 1994-06-27 1997-01-14 Varian Associates, Inc. Nuclear magnetic resonance receiver, method and system
US5862005A (en) 1994-10-11 1999-01-19 Quantum Corporation Synchronous detection of wide bi-phase coded servo information for disk drive
US5696639A (en) 1995-05-12 1997-12-09 Cirrus Logic, Inc. Sampled amplitude read channel employing interpolated timing recovery
US5796535A (en) 1995-05-12 1998-08-18 Cirrus Logic, Inc. Sampled amplitude read channel employing a user data frequency synthesizer and a servo data frequency synthesizer
US5668679A (en) 1995-12-21 1997-09-16 Quantum Corporation System for self-servowriting a disk drive
US5987562A (en) 1996-03-08 1999-11-16 Texas Instruments Incorporated Waveform sampler and method for sampling a signal from a read channel
US6023383A (en) 1996-03-19 2000-02-08 Texas Instruments Incorporated Error estimation circuit and method for providing a read channel error signal
US5787125A (en) 1996-05-06 1998-07-28 Motorola, Inc. Apparatus for deriving in-phase and quadrature-phase baseband signals from a communication signal
FR2748571B1 (fr) 1996-05-09 1998-08-07 Europ Agence Spatiale Dispositif de recepteur pour systeme de navigation notamment par satellite
JP3823195B2 (ja) * 1996-10-08 2006-09-20 ソニー株式会社 クロック生成装置およびディスク駆動装置
US5844920A (en) 1996-11-07 1998-12-01 Cirrus Logic, Inc. Thermal asperity compensation using multiple sync marks for retroactive and split segment data synchronization in a magnetic disk storage system
US5892632A (en) 1996-11-18 1999-04-06 Cirrus Logic, Inc. Sampled amplitude read channel employing a residue number system FIR filter in an adaptive equalizer and in interpolated timing recovery
US5835295A (en) 1996-11-18 1998-11-10 Cirrus Logice, Inc. Zero phase restart interpolated timing recovery in a sampled amplitude read channel
US5901010A (en) 1997-02-07 1999-05-04 Cirrus Logic, Inc. Magnetic disc recording system employing two stage actuators for simultaneous accesses through multiple recording heads
US5781129A (en) 1997-03-03 1998-07-14 Motorola, Inc. Adaptive encoder circuit for multiple data channels and method of encoding
US6411452B1 (en) 1997-03-11 2002-06-25 Western Digital Technologies, Inc. Disk drive employing read error tolerant sync mark detection
US5970104A (en) 1997-03-19 1999-10-19 Cadence Design Systems, Inc. Method and apparatus for generating branch metrics and branch indices for convolutional code Viterbi decoders
US6081397A (en) 1997-04-08 2000-06-27 International Business Machines Corporation Method and apparatus for SID-to-SID period estimation
US6009549A (en) 1997-05-15 1999-12-28 Cirrus Logic, Inc. Disk storage system employing error detection and correction of channel coded data, interpolated timing recovery, and retroactive/split-segment symbol synchronization
US5955783A (en) 1997-06-18 1999-09-21 Lsi Logic Corporation High frequency signal processing chip having signal pins distributed to minimize signal interference
US5986830A (en) 1997-07-30 1999-11-16 Cirrus Logic, Inc. Read/write channel write precompensation system and method using one or more delay clocks
US6493162B1 (en) 1997-12-05 2002-12-10 Seagate Technology Llc Frame synchronization for viterbi detector
US6111712A (en) * 1998-03-06 2000-08-29 Cirrus Logic, Inc. Method to improve the jitter of high frequency phase locked loops used in read channels
US6158107A (en) 1998-04-02 2000-12-12 International Business Machines Corporation Inverted merged MR head with plated notched first pole tip and self-aligned second pole tip
US6441661B1 (en) 1998-06-30 2002-08-27 Asahi Kasei Kabushiki Kaisha PLL circuit
US6208478B1 (en) 1998-07-07 2001-03-27 Texas Instruments Incorporated Read clock interface for read channel device
US6269058B1 (en) 1999-01-04 2001-07-31 Texas Instruments Incorporated Wide capture range circuitry
JP3683120B2 (ja) * 1999-04-16 2005-08-17 松下電器産業株式会社 クロック再生装置
US6657802B1 (en) 1999-04-16 2003-12-02 Infineon Technologies Corporation Phase assisted synchronization detector
US6404829B1 (en) 1999-06-29 2002-06-11 Oak Technology, Inc. DC insensitive AGC circuit for optical PRML read channel
KR100658863B1 (ko) 2000-01-14 2006-12-15 마츠시타 덴끼 산교 가부시키가이샤 광 디스크 및 광 디스크의 어드레스 판독 장치 및 방법
US6530060B1 (en) 2000-02-08 2003-03-04 Cirrus Logic, Inc. Sampled amplitude read channel employing a post processor with a boundary error compensator which compensates for boundary error events in a split-field data sector
US6519102B1 (en) 2000-04-27 2003-02-11 International Business Machines Corporation Method and apparatus for implementing an in-situ digital harmonic computation facility for direct access storage device (DASD)
US6775529B1 (en) 2000-07-31 2004-08-10 Marvell International Ltd. Active resistive summer for a transformer hybrid
US6717764B2 (en) 2000-06-02 2004-04-06 Seagate Technology Llc Method and apparatus for head fly height measurement
US6816328B2 (en) 2000-06-20 2004-11-09 Infineon Technologies North America Corp. Pseudo-synchronous interpolated timing recovery for a sampled amplitude read channel
US6400518B1 (en) 2000-11-01 2002-06-04 International Business Machines Corporation Magneto-resistive asymmetry correction circuit
US6606048B1 (en) 2000-11-16 2003-08-12 Marvell International, Ltd. Method and apparatus for equalizing the digital performance of multiple ADC's
US6490110B2 (en) 2000-12-05 2002-12-03 Cirrus Logic, Inc. Servo data detection with improved phase shift tolerance
JP2002175673A (ja) 2000-12-07 2002-06-21 Nec Corp Ｐｌｌ回路、データ検出回路及びディスク装置
EP1750256B1 (en) 2000-12-26 2008-12-24 Panasonic Corporation Recording medium, recording method, reproduction method, recording apparatus and reproduction apparatus
JP4112809B2 (ja) 2001-01-31 2008-07-02 株式会社東芝 垂直磁気記録方式の磁気ディスク装置及びディスク製造方法
US6603622B1 (en) 2001-02-28 2003-08-05 Western Digital Technologies, Inc. Disk drive employing a sync mark detector comprising a matched filter and a dual polarity correlator
US6963521B2 (en) 2001-03-30 2005-11-08 Sony Corporation Disc drive apparatus
JP2002329329A (ja) 2001-04-27 2002-11-15 Sony Corp 相変化記録方式の光ディスク及び光ディスク装置
US6865040B2 (en) 2001-05-22 2005-03-08 Seagate Technology, Llc Method and system for measuring fly height
US6633447B2 (en) 2001-05-25 2003-10-14 Infineon Technologies Ag Method and apparatus for compensation of second order distortion
JP4726337B2 (ja) 2001-06-27 2011-07-20 ルネサスエレクトロニクス株式会社 ワンチップマイクロコンピュータ
KR100734738B1 (ko) * 2001-07-27 2007-07-03 인터내셔널 비지네스 머신즈 코포레이션 클록 데이터 복원 시스템, 클록 생성 시스템 및 클록신호의 재샘플링 방법
US6856183B2 (en) 2001-10-12 2005-02-15 Agere Systems Inc. Scheme to improve performance of timing recovery systems for read channels in a disk drive
US6813108B2 (en) 2001-10-24 2004-11-02 Agere Systems Inc. Servo data detection in presence of radial incoherence using multiple data detectors
US7082005B2 (en) 2001-10-24 2006-07-25 Agere Systems Inc. Servo data detection in the presence or absence of radial incoherence using digital interpolators
JP4109003B2 (ja) * 2002-01-21 2008-06-25 富士通株式会社 情報記録再生装置、信号復号回路及び方法
US7126776B1 (en) 2002-04-17 2006-10-24 Western Digital Technologies, Inc. Disk drive having a sector clock that is synchronized to the angular speed of the spindle motor
US7088533B1 (en) 2002-04-23 2006-08-08 Maxtor Corporation Method of self-servo writing in a disk drive using a spiral pattern
TW563318B (en) 2002-05-20 2003-11-21 Via Optical Solution Inc Timing recovery circuit and method
JP2004014090A (ja) 2002-06-11 2004-01-15 Fujitsu Ltd データ再生装置、再生方法、及び再生装置の制御を行う回路
JP2004095047A (ja) 2002-08-30 2004-03-25 Toshiba Corp ディスク記憶装置及び同装置におけるサーボアドレスマーク検出方法
US7180696B2 (en) 2002-12-27 2007-02-20 Matsushita Electric Industrial Co., Ltd. Methods for selective multi-pass servowriting and self-servowriting
US7092462B2 (en) 2003-01-14 2006-08-15 Agere Systems Inc. Asynchronous servo RRO detection employing interpolation
JP2004253042A (ja) * 2003-02-19 2004-09-09 Sony Corp ディスク装置
US7199961B1 (en) 2003-03-25 2007-04-03 Marvell International Ltd. Detecting fly height of a head over a storage medium
US7136250B1 (en) 2003-03-25 2006-11-14 Marvell International Ltd. Detecting fly height of a head over a storage medium
US7116504B1 (en) 2003-03-25 2006-10-03 Marvell International Ltd. DC-offset compensation loops for magnetic recording system
US7002761B1 (en) 2003-03-27 2006-02-21 Marvell International Ltd. Demodulation compensation for spiral servo tracks in hard disk drives
US7339861B2 (en) * 2003-04-21 2008-03-04 Matsushita Electric Industrial Co., Ltd. PLL clock generator, optical disc drive and method for controlling PLL clock generator
US6912099B2 (en) 2003-05-13 2005-06-28 Agere Systems Inc. Maximum likelihood detection of asynchronous servo data employing interpolation
KR20060017788A (ko) 2003-05-16 2006-02-27 톰슨 라이센싱 Ｄｓｐ-기반의 데이터 복구
US7191382B2 (en) 2003-06-02 2007-03-13 Fujitsu Limited Methods and apparatus for correcting data and error detection codes on the fly
US7308057B1 (en) 2003-06-05 2007-12-11 Maxtor Corporation Baseline wander compensation for perpendicular recording
US7038875B2 (en) 2003-07-31 2006-05-02 Seagate Technology Llc Dynamic measurement of head media spacing modulation
US7016131B2 (en) 2003-08-29 2006-03-21 Agency For Science, Technology And Research Method and implementation of in-situ absolute head medium spacing measurement
US7203017B1 (en) 2003-09-23 2007-04-10 Marvell International Ltd. Timing recovery for data storage channels with buffered sectors
US7620101B1 (en) 2003-09-24 2009-11-17 Cypress Semiconductor Corporation Equalizer circuit, communication system, and method that is adaptive to varying launch amplitudes for reducing receiver error
US7002767B2 (en) 2003-09-30 2006-02-21 Agere Systems Inc. Detection of recorded data employing interpolation with gain compensation
US7663831B2 (en) 2003-11-18 2010-02-16 Sony Corporation Reproduction device and method, recording medium, and program
US7133227B2 (en) 2004-01-21 2006-11-07 Seagate Technology Llc Head polarity detection algorithm and apparatus
US7154689B1 (en) 2004-02-05 2006-12-26 Maxtor Corporation Apparatus for writing servo bursts on a disk with servo track pitch based on read element width and methods of manufacturing same
US7230789B1 (en) 2004-04-08 2007-06-12 Maxtor Corporation Method and apparatus for performing a self-servo write operation in a disk drive using spiral servo information
US7180693B2 (en) 2004-04-14 2007-02-20 Agere Systems Inc. Method and apparatus for maximum likelihood detection of data employing interpolation with compensation of signal asymmetry
US8405924B2 (en) 2004-04-30 2013-03-26 Agere Systems Llc Method and apparatus for improved address mark detection
US7286313B2 (en) 2004-05-26 2007-10-23 Seagate Technology, Llc Correcting radial incoherence in servo track sensing
JP4427392B2 (ja) 2004-06-22 2010-03-03 株式会社東芝 磁気記録媒体、その製造方法及び磁気記録再生装置
US7079342B1 (en) 2004-07-26 2006-07-18 Marvell International Ltd. Method and apparatus for asymmetry correction in magnetic recording channels
US7248426B1 (en) 2004-07-30 2007-07-24 Western Digital Technologies, Inc. Servo writing a disk drive from spiral tracks by shifting a demodulation window an integer number of sync mark intervals
CN101027727A (zh) 2004-08-20 2007-08-29 松下电器产业株式会社 信息重放装置
US7253984B1 (en) 2004-09-02 2007-08-07 Maxtor Corporation Disk drive that generates a position error signal and a fly height signal from a servo burst pattern
US7193544B1 (en) 2004-09-08 2007-03-20 Northrop Grumman Corporation Parallel, adaptive delta sigma ADC
US7206146B2 (en) 2004-10-27 2007-04-17 Hitachi Global Storage Technologies Netherlands B.V. Biphase magnetic pattern detector using multiple matched filters for hard disk drive
US7199959B1 (en) * 2004-12-13 2007-04-03 Western Digital Technologies, Inc. Repeatable timing error correction system for use in a servo writer
US7248425B2 (en) 2004-12-14 2007-07-24 Samsung Electronics Co., Ltd. Disk writing/reproducing apparatus and method
US7167328B2 (en) 2004-12-17 2007-01-23 Agere Systems Inc. Synchronizing an asynchronously detected servo signal to synchronous servo demodulation
US7193798B2 (en) 2005-01-12 2007-03-20 Agere Systems, Inc. Method and apparatus for encoding and decoding a runout correction bit pattern of servo field
JP4641815B2 (ja) 2005-02-04 2011-03-02 パナソニック株式会社 光ディスク再生装置
US7646557B2 (en) * 2005-07-05 2010-01-12 Xyratex Technology Limited Methods and apparatus for generating a clock signal, for writing servo tracks, and for characterising timing errors in a servo track writer
US7362536B1 (en) 2005-07-08 2008-04-22 Maxtor Corporation Disk drive that compensates for phase incoherence between radially adjacent servo tracks and methods thereof
US7492850B2 (en) * 2005-08-31 2009-02-17 International Business Machines Corporation Phase locked loop apparatus with adjustable phase shift
US7529320B2 (en) 2005-09-16 2009-05-05 Agere Systems Inc. Format efficient timing acquisition for magnetic recording read channels
JP2007087537A (ja) 2005-09-22 2007-04-05 Rohm Co Ltd 信号処理装置、信号処理方法、および記憶システム
US7693243B2 (en) 2005-09-26 2010-04-06 Via Technologies, Inc. Method and circuit for timing recovery
US7508611B2 (en) * 2005-10-07 2009-03-24 Seagate Technology, Llc Disk drive clock circuit that adjusts clock edge timing in response to servo information and methods thereof
US7432750B1 (en) 2005-12-07 2008-10-07 Netlogic Microsystems, Inc. Methods and apparatus for frequency synthesis with feedback interpolation
US7529052B2 (en) * 2005-12-19 2009-05-05 Broadcom Corporation Disk controller and methods for use therewith
US7400464B1 (en) 2006-02-24 2008-07-15 Marvell International Ltd. Synchronous RRO write
JP4413199B2 (ja) 2006-03-23 2010-02-10 東芝ストレージデバイス株式会社 偏心補正方法、信号処理回路、磁気記憶装置及び垂直磁気記録媒体
JP4379814B2 (ja) 2006-03-28 2009-12-09 富士通株式会社 記憶装置、制御方法、制御装置及びプログラム
JP2007287273A (ja) * 2006-04-19 2007-11-01 Hitachi Global Storage Technologies Netherlands Bv ディスク・ドライブ装置及びそのユーザ・データの書き込み及び／もしくは読み出し方法
US7423827B2 (en) 2006-04-20 2008-09-09 Agere Systems Inc. Systems and methods for accessing data from a variable polarity head assembly
US7679850B2 (en) 2006-05-11 2010-03-16 Seagate Technology Llc Position determination using circular shift codes
US7796480B2 (en) 2006-06-05 2010-09-14 Mediatek Inc. Apparatus and methods for light spot servo signal detection
US7265937B1 (en) 2006-06-09 2007-09-04 Seagate Technology Llc Positioning of a head array over a data storage medium
US7411531B2 (en) 2006-06-30 2008-08-12 Agere Systems Inc. Methods and apparatus for asynchronous sampling of a received signal at a downsampled rate
US7525460B1 (en) 2006-07-13 2009-04-28 Marvell International Ltd. Timing loop based on analog to digital converter output and method of use
FR2904168B1 (fr) 2006-07-18 2008-12-19 Thales Sa Systeme d'estimation de la qualite de reception d'une transmission numerique.
KR100712559B1 (ko) * 2006-07-24 2007-05-02 삼성전자주식회사 기준 클럭 주파수 조정 방법 및 장치와 이를 이용한 디스크드라이브
US20080056403A1 (en) 2006-09-01 2008-03-06 On Demand Microelectronics Method and apparatus for timing recovery of pam signals
US7499238B2 (en) 2006-09-22 2009-03-03 Agere Systems Inc. Systems and methods for improving disk drive synchronization
US7643235B2 (en) 2006-09-28 2010-01-05 Seagate Technology Llc Synchronization for data communication
TWI392297B (zh) 2006-10-06 2013-04-01 Realtek Semiconductor Corp 補償基線游離的裝置及方法
US7446690B2 (en) 2006-11-06 2008-11-04 Atmel Corporation Apparatus and method for implementing an analog-to-digital converter in programmable logic devices
US7420498B2 (en) 2006-11-22 2008-09-02 Infineon Technologies Ag Signal converter performing a role
US7768730B2 (en) 2007-04-30 2010-08-03 Broadcom Corporation Base line control electronics architecture
US7675703B2 (en) * 2007-06-08 2010-03-09 Hitachi Global Storage Technologies Netherlands B.V. Magnetic recording disk drive with patterned media and system for clocking write data
US7602567B2 (en) 2007-06-28 2009-10-13 Lsi Corporation Feed-forward DC restoration in a perpendicular magnetic read channel
US8102960B2 (en) 2008-03-28 2012-01-24 Intel Corporation Adaptation of a digital receiver
JP5025543B2 (ja) * 2008-03-28 2012-09-12 株式会社東芝 磁気記憶制御装置、磁気記憶制御方法、磁気記憶装置
US8599973B2 (en) 2008-04-30 2013-12-03 HGST Netherlands B.V. Detection of synchronization mark from output of matched filter upstream of Viterbi detector
US7929237B2 (en) * 2008-06-27 2011-04-19 Agere Systems Inc. Modulated disk lock clock and methods for using such
US8027117B1 (en) * 2008-08-25 2011-09-27 Marvell International Ltd. Zone servo writing using self servo writing
US20100118426A1 (en) * 2008-11-07 2010-05-13 Barmeshwar Vikramaditya Write clock control system for media pattern write synchronization
US7911724B2 (en) * 2009-02-10 2011-03-22 Seagate Technology Llc Write synchronization phase calibration for storage media
US8213106B1 (en) * 2009-03-10 2012-07-03 Western Digital Technologies, Inc. Zoned servo system
US8477444B1 (en) * 2009-05-27 2013-07-02 Marvell International Ltd. Clock frequency synchronization for magnetic recording device
US8174949B2 (en) * 2009-07-02 2012-05-08 Lsi Corporation Systems and methods for format efficient timing recovery in a read channel
US8508879B1 (en) * 2010-01-21 2013-08-13 Marvell International Ltd. Write clock rephase for magnetic recording device

Also Published As

Publication number Publication date
CN103021436B (zh) 2017-03-01
US20130077188A1 (en) 2013-03-28
EP2573771A3 (en) 2014-11-05
KR20130032820A (ko) 2013-04-02
JP2013069398A (ja) 2013-04-18
CN103021436A (zh) 2013-04-03
US8780476B2 (en) 2014-07-15
EP2573771A2 (en) 2013-03-27
TW201329963A (zh) 2013-07-16

Similar Documents

Publication Publication Date Title
CN101320587B (zh) 带有模式化介质的磁记录盘驱动器和计时写数据的系统
US8169735B1 (en) Zone servo writing using self servo writing
US6738205B1 (en) Self-writing of servo patterns in disk drives
CN101743592B (zh) 使用伺服数据控制飞行高度的系统和方法
JP5216100B2 (ja) サーボアドレスマークデータを用いたフライングハイト制御のためのシステム及び方法
US7400464B1 (en) Synchronous RRO write
US9305581B2 (en) Systems and methods for memory efficient repeatable run out processing
US8780470B1 (en) Disk drive adjusting digital phase locked loop over sector data with frequency induced phase error measured over preamble
US7929237B2 (en) Modulated disk lock clock and methods for using such
US8749911B1 (en) Disk drive accounting for fractional clock cycle when measuring reader/writer gap
US8605379B1 (en) Disk drive averaging phase-offset due to reader/writer gap in order to recover extended servo data
US8755139B1 (en) System with servo clock and write clock based phase estimation for discontinuous media writing
US8498072B2 (en) Systems and methods for spiral waveform detection
CN114141273B (zh) 限定磁道轨迹以减小ac磁道压缩的数据存储装置
US8873181B1 (en) Method and apparatuses for synchronizing writing of data with a pattern of bit islands of media
CN100377217C (zh) 头部位置控制用校正表创建方法、头部位置控制方法及盘装置
JP5840546B2 (ja) ストレージデバイスにおける制御されたウェッジスペーシングのためのシステム及び方法
US7508611B2 (en) Disk drive clock circuit that adjusts clock edge timing in response to servo information and methods thereof
KR0160320B1 (ko) 변환기의 판독 소자 폭이 데이타 실린더 폭의 1/3 이상 1/2 이하인 직접 접근 저장 장치에서의 서보 위치 설정 방법 및 장치
US8711507B1 (en) Gate timing for short servo wedge in disk memory systems
JP2003526870A (ja) クロック・データを記憶媒体に書き込むための方法および装置
US12206753B1 (en) Unified time base for storage device data channel
US8947810B1 (en) Bit-locked interface for magnetic recording
Baker Direct print servo patterns for disk drives
US8300343B2 (en) Magnetic bit-patterned disk and disk drive

Legal Events

Date Code Title Description
RD03 Notification of appointment of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7423

Effective date: 20140716

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150210

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20150210

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20150910

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20151013

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20151111

R150 Certificate of patent or registration of utility model

Ref document number: 5840546

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313113

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

LAPS Cancellation because of no payment of annual fees