DE3480131D1 - Phase modulated servo system for a disk file - Google Patents

Phase modulated servo system for a disk file

Info

Publication number
DE3480131D1
DE3480131D1 DE8484105756T DE3480131T DE3480131D1 DE 3480131 D1 DE3480131 D1 DE 3480131D1 DE 8484105756 T DE8484105756 T DE 8484105756T DE 3480131 T DE3480131 T DE 3480131T DE 3480131 D1 DE3480131 D1 DE 3480131D1
Authority
DE
Germany
Prior art keywords
servo system
phase modulated
disk file
modulated servo
file
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
Application number
DE8484105756T
Other languages
English (en)
Inventor
Frederick Axmear
David Collins
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Application granted granted Critical
Publication of DE3480131D1 publication Critical patent/DE3480131D1/de
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G11B5/54—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 into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/10—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
    • G11B21/106—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following on disks
    • 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
    • G11B5/59605—Circuits
    • G11B5/59616—Synchronisation; Clocking
    • 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
    • G11B5/59627—Aligning for runout, eccentricity or offset compensation
DE8484105756T 1983-06-27 1984-05-21 Phase modulated servo system for a disk file Expired DE3480131D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/507,647 US4549232A (en) 1983-06-27 1983-06-27 Phase modulated servo system

Publications (1)

Publication Number Publication Date
DE3480131D1 true DE3480131D1 (en) 1989-11-16

Family

ID=24019546

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8484105756T Expired DE3480131D1 (en) 1983-06-27 1984-05-21 Phase modulated servo system for a disk file

Country Status (5)

Country Link
US (1) US4549232A (de)
EP (1) EP0129708B1 (de)
JP (1) JPS6010472A (de)
DE (1) DE3480131D1 (de)
SG (1) SG25591G (de)

Families Citing this family (87)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642562A (en) * 1984-06-27 1987-02-10 International Business Machines Corporation Phase difference demodulator
US4598327A (en) * 1985-06-28 1986-07-01 International Business Machines Corporation Servo control system using servo pattern time of flight for read/write head positioning in a magnetic recording system
JP2914971B2 (ja) * 1987-09-14 1999-07-05 株式会社日立製作所 磁気ディスク装置
JPH0291866A (ja) * 1988-09-28 1990-03-30 Nec Corp 磁気ディスク装置
KR950008751B1 (ko) * 1988-11-30 1995-08-04 엘지전자주식회사 자기 디스크 기록 장치에서 트랙 중심을 찾는 장치 및 방법
US5327408A (en) * 1990-09-07 1994-07-05 International Business Machines Corporation Optical disk with sector servo patterns compensating for variations in pattern size and/or radial velocity
US5343340A (en) * 1992-12-31 1994-08-30 International Business Machines Corporation Digital servo signal demodulation method and apparatus utilizing a partial-response maximum-likelihood (PRML) channel in a disk file
US5424881A (en) 1993-02-01 1995-06-13 Cirrus Logic, Inc. Synchronous read channel
JP3313175B2 (ja) * 1993-02-19 2002-08-12 富士通株式会社 ディスク装置のサーボ位置検出装置及びその方法
US5608587A (en) * 1993-08-06 1997-03-04 Seagate Technology, Inc. Method using magnetic disk servo pattern with buried identification patterns
CA2127971C (en) * 1993-09-23 1999-01-12 Todd Barry Anderson Method and apparatus for phase modulated servo positioning in a direct access storage device
JP2635942B2 (ja) * 1994-02-10 1997-07-30 インターナショナル・ビジネス・マシーンズ・コーポレイション 直接アクセス記憶装置のサーボ位置決めの方法及び装置
US5694265A (en) * 1994-04-19 1997-12-02 Fujitsu Limited Disk apparatus for detecting position of head by reading phase servo pattern
US5689384A (en) 1994-06-30 1997-11-18 International Business Machines Corporation Timing based servo system for magnetic tape systems
US5615065A (en) * 1994-10-04 1997-03-25 International Business Machines Corporation Phase-compensated servo pattern and position error-sensing detector
JP3642821B2 (ja) * 1995-03-17 2005-04-27 富士通株式会社 磁気ヘッドスライダ
US5600506A (en) * 1995-05-10 1997-02-04 Conner Peripherals, Inc. Apparatus and method for determining the position of a transducer relative to a disk surface in a disk drive system
JP3245343B2 (ja) * 1995-12-28 2002-01-15 富士通株式会社 ディスク装置及びディスク装置用位相復調装置並びにディスク装置の位相復調方法
KR100274522B1 (ko) * 1996-03-14 2001-01-15 니시무로 타이죠 멀티자기헤드및이것을구비한자기디스크장치
US6014283A (en) * 1997-05-15 2000-01-11 Western Digital Corporation Non-quadrature servo burst pattern for micro-jogging a magnetoresistive head in a magnetic disk drive
US5930065A (en) * 1997-05-16 1999-07-27 International Business Machines Corporation Timing based servo longitudinal addressing
JP3013892B2 (ja) 1997-06-26 2000-02-28 日本電気株式会社 ヘッド位置信号復調装置及びこれを利用したヘッド位置決め装置
US5923272A (en) * 1997-07-08 1999-07-13 International Business Machines Corporation Serial bitstream code for timing-based servo
US6025970A (en) * 1997-08-07 2000-02-15 International Business Machines Corporation Digital demodulation of a complementary two-frequency servo PES pattern
US5966264A (en) * 1997-08-07 1999-10-12 International Business Machines Cororation Two frequency servo PES pattern
JP3384728B2 (ja) 1997-11-12 2003-03-10 松下電器産業株式会社 磁気記録再生装置の製造方法及び磁気記録再生装置
JP2000100098A (ja) * 1998-09-17 2000-04-07 Fujitsu Ltd サーボ情報書込方法及び記憶装置
JP3340077B2 (ja) 1998-11-30 2002-10-28 富士通株式会社 サーボ制御方法及び情報記憶装置
US6542325B1 (en) * 1999-03-10 2003-04-01 Imation Corp. Time-based servo for magnetic storage media
US6278571B1 (en) * 1999-05-19 2001-08-21 International Business Machines Corporation Adaptive servo gap detection for timing based servo
US6239939B1 (en) * 1999-08-09 2001-05-29 International Business Machines Corporation Robust detection of data modulated into a timing based servo
JP2001110027A (ja) 1999-10-08 2001-04-20 Hitachi Ltd 磁気記憶装置
JP3877133B2 (ja) * 2001-02-16 2007-02-07 富士通株式会社 信号再生方法及び記憶装置
US6961203B1 (en) * 2001-03-06 2005-11-01 Maxtor Corporation Hybrid printed servo patterns for magnetic media and hard disk systems implementing same
US7830630B2 (en) * 2001-06-28 2010-11-09 Stmicroelectronics, Inc. Circuit and method for detecting the phase of a servo signal
US6754022B1 (en) 2001-07-16 2004-06-22 Imation Corp. High-speed current driver
US6781778B1 (en) * 2001-07-16 2004-08-24 Imation Corp. Time-based sectored servo data format
WO2003017276A1 (fr) * 2001-08-10 2003-02-27 Fujitsu Limited Procede permettant de detecter une position, enregistreur/reproducteur d'informations et support d'enregistrement d'informations
US7072133B1 (en) 2001-10-15 2006-07-04 Imation Corp. Servo mark verify head
US6859339B2 (en) * 2002-01-31 2005-02-22 Matsushita Electric Industrial Co., Ltd. Master information magnetic recording apparatus and method for manufacturing magnetic recording medium in which information is recorded by using this
JP4080233B2 (ja) 2002-05-07 2008-04-23 富士通株式会社 磁気記録装置および磁気記録媒体
US6639529B1 (en) * 2002-05-14 2003-10-28 Mitutoyo Corporation System and method for delay calibration in position encoders
US6826140B2 (en) * 2002-08-26 2004-11-30 Bae Systems Information And Electronic Systems Integration Inc Multichannel digital recording system with multi-user detection
AU2003300461A1 (en) * 2003-02-14 2004-09-09 Bill Richard Baker Compound phase encoding for printed servo patterns
US7227714B2 (en) * 2003-07-22 2007-06-05 Matsushita Electric Industrial Co., Ltd. Methods for conditional servowriting
US7106548B2 (en) * 2003-07-22 2006-09-12 Matsushita Electric Industrial Co., Ltd. Methods for WORF improvement in conditional servowriting
US7522506B2 (en) * 2003-11-03 2009-04-21 Hewlett-Packard Development Company, L.P. Memory
US7136251B2 (en) * 2003-12-24 2006-11-14 Matsushita Electric Industrial, Co., Ltd. Methods for WORF improvement in conditional servowriting
US7206170B2 (en) * 2004-05-19 2007-04-17 Imetion Corp. Thin film servo head apparatus with canted servo gaps
US7209314B2 (en) * 2005-06-09 2007-04-24 Hitachi Global Storage Technologies Netherlands B.V. Disk drive with phase-quadrature servo pattern and demodulated position error signal insensitive to timing and phase-misalignment errors
US7440224B2 (en) * 2006-01-23 2008-10-21 Toshiba Corporation Disk drive servo
US7721049B2 (en) * 2006-03-27 2010-05-18 Kabuhsiki Kaisha Toshiba Disk drive write method
US20070279782A1 (en) * 2006-05-31 2007-12-06 Rydhan Abdul R Method and apparatus for determining offset between read and write transducers in a disk drive
US7468859B2 (en) * 2006-05-31 2008-12-23 Kabushiki Kaisha Toshiba Voice coil motor effective resistance determination
US7453660B2 (en) * 2006-05-31 2008-11-18 Kabushiki Kaisha Toshiba Shock feed forward adaptive filters
US20070279790A1 (en) * 2006-05-31 2007-12-06 Tanner Brian K Adjustable output voltage regulator for disk drive
US7457066B2 (en) * 2006-05-31 2008-11-25 Kabushiki Kiasha Toshiba Method and apparatus for phase-shift null-burst-pattern
US20070279788A1 (en) * 2006-05-31 2007-12-06 Toshiba America Information Systems, Inc. Method and apparatus to perform defect scanning
US7436616B2 (en) * 2006-05-31 2008-10-14 Toshiba Corporation Current pulsing for unloading
US20070279781A1 (en) * 2006-05-31 2007-12-06 Toshiba America Information Systems, Inc. Channel training method and apparatus
US7365929B2 (en) * 2006-07-30 2008-04-29 International Business Machines Corporation Synchronous servo channel for tape drive systems
US7492540B2 (en) * 2006-09-15 2009-02-17 Hitachi Global Storage Technologies Netherlands B.V. Apparatus system and method for variable data density patterned media
US20080144211A1 (en) * 2006-12-18 2008-06-19 Weber Mark P Servo techniques that mitigate an effect of read and write velocity variations on position error signal calculations
JP2008165918A (ja) 2006-12-28 2008-07-17 Fujitsu Ltd サーボパターン書き込み装置、サーボパターン書き込み方法、サーボパターン読み取り装置、サーボパターン読み取り方法
US7495859B2 (en) * 2007-02-20 2009-02-24 Imation Corp. Interleaved servo pattern
US7848039B2 (en) * 2007-08-11 2010-12-07 Hitachi Global Storage Technologies Netherlands B.V. Magnetic recording disk and disk drive with patterned phase-type servo fields for read/write head positioning
US7848040B2 (en) * 2007-08-17 2010-12-07 Hitachi Global Storage Technologies Netherlands B.V. Magnetic recording disk and disk drive with amplitude-type servo fields having patterned alternating-polarity servo islands for read/write head positioning
US7612961B2 (en) * 2007-10-12 2009-11-03 Hitachi Global Storage Technologies Netherlands B.V. Magnetic recording disk and disk drive with patterned phase-type servo fields for read/write head positioning
US7729073B2 (en) * 2007-10-12 2010-06-01 Hitachi Global Storage Technologies Netherlands B.V. Magnetic recording disk and disk drive with amplitude-type servo fields having patterned servo islands for read/write head positioning
US7944643B1 (en) * 2007-12-05 2011-05-17 Wd Media, Inc. Patterns for pre-formatted information on magnetic hard disk media
JP4868422B2 (ja) * 2008-08-29 2012-02-01 東芝ストレージデバイス株式会社 磁気記憶媒体および磁気記憶媒体駆動装置
US7880992B2 (en) * 2008-09-02 2011-02-01 Seagate Technology Llc Phase detector that compensates for frequency variation induced bias in phases of servo burst fields
US8824079B2 (en) * 2008-09-15 2014-09-02 Seagate Technology Llc Servo patterns for bit patterned media with multiple dots per servo period
US7920354B2 (en) * 2008-09-15 2011-04-05 Seagate Technology Llc Phase servo patterns for bit patterned media
US8947809B2 (en) 2008-09-19 2015-02-03 Seagate Technology Llc Encoding scheme for bit patterned media
US7746594B1 (en) 2008-09-29 2010-06-29 Western Digital Technologies, Inc. Disk drive comprising slanted line servo burst sets offset radially
US7916416B1 (en) 2008-09-29 2011-03-29 Western Digital Technologies, Inc. Disk drive comprising slanted line servo bursts having a varying tilt angle
US7746595B1 (en) 2008-09-29 2010-06-29 Western Digital Technologies, Inc. Disk drive comprising slanted line servo bursts having reverse polarity segments
US9514775B2 (en) * 2008-11-25 2016-12-06 Seagate Technology Llc Reducing effect of frequency acquisition error in a position error signal responsive to split servo burst patterns
US7995304B2 (en) * 2009-05-27 2011-08-09 Seagate Technology Llc Circuits that use a postamble signal to determine phase and frequency errors in the acquisition of a preamble signal
US8059350B2 (en) * 2009-10-22 2011-11-15 Hitachi Global Storage Technologies Netherlands B.V. Patterned magnetic recording disk with patterned servo sectors having chevron servo patterns
US8000048B2 (en) * 2009-12-09 2011-08-16 Hitachi Global Storage Technologies Netherlands B.V. Magnetic recording disk and disk drive with track identification using phase-type servo patterns
JP2014059932A (ja) 2012-09-19 2014-04-03 Toshiba Corp 磁気ディスク装置および復調位置補正方法
US8625231B1 (en) * 2012-11-08 2014-01-07 HGST Netherlands B.V. Adjusting VGA analog gain for misaligned servo sectors in a disk drive
US8848303B1 (en) 2013-05-13 2014-09-30 Kabushiki Kaisha Toshiba Disk storage apparatus and method for servo demodulation
US8908303B1 (en) 2013-07-30 2014-12-09 Kabushiki Kaisha Toshiba Method for servo demodulation and disk storage apparatus
CN104658555A (zh) 2013-11-25 2015-05-27 株式会社东芝 头位置解调方法及磁盘装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427606A (en) * 1966-03-02 1969-02-11 Ibm Memory system
US3812533A (en) * 1972-12-22 1974-05-21 Vermont Res Corp Information storage unit transducer positioning system
US4052741A (en) * 1975-12-23 1977-10-04 International Business Machines Corporation Track seeking and following
US4048660A (en) * 1975-12-23 1977-09-13 International Business Machines Corporation Record track following and seeking
DE2558359A1 (de) * 1975-12-23 1977-07-07 Ibm Deutschland Einstellvorrichtung fuer den zugriffsarm des magnetkopfes eines magnetplattenspeichers
DE2928311A1 (de) * 1979-07-13 1981-02-05 Basf Ag Spurlageregelung fuer ein system zur aufzeichnung/wiedergabe von informationen auf einem magnetaufzeichnungstraeger, insbesondere einem flexiblen magnetaufzeichnungstraeger
US4405956A (en) * 1981-04-22 1983-09-20 Xerox Corporation Tracking apparatus for read/write head
US4488188A (en) * 1982-11-01 1984-12-11 International Business Machines Corporation Buried servo recording system using phase encoded servo pattern

Also Published As

Publication number Publication date
SG25591G (en) 1991-06-21
JPS6010472A (ja) 1985-01-19
EP0129708B1 (de) 1989-10-11
EP0129708A1 (de) 1985-01-02
US4549232A (en) 1985-10-22
JPH0250550B2 (de) 1990-11-02

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8339 Ceased/non-payment of the annual fee