DE69032739D1 - Verfahren und System zur Demodulation von Lagesignalen eines Transducers - Google Patents

Verfahren und System zur Demodulation von Lagesignalen eines Transducers

Info

Publication number
DE69032739D1
DE69032739D1 DE69032739T DE69032739T DE69032739D1 DE 69032739 D1 DE69032739 D1 DE 69032739D1 DE 69032739 T DE69032739 T DE 69032739T DE 69032739 T DE69032739 T DE 69032739T DE 69032739 D1 DE69032739 D1 DE 69032739D1
Authority
DE
Germany
Prior art keywords
transducer
position signals
demodulating position
demodulating
signals
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
DE69032739T
Other languages
English (en)
Other versions
DE69032739T2 (de
Inventor
Gerald Lee Weispfenning
Lloyd Chambers Goss
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.)
Seagate Technology LLC
Original Assignee
Seagate Technology International
Seagate Technology LLC
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 Seagate Technology International, Seagate Technology LLC filed Critical Seagate Technology International
Publication of DE69032739D1 publication Critical patent/DE69032739D1/de
Application granted granted Critical
Publication of DE69032739T2 publication Critical patent/DE69032739T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G11B5/58—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
    • G11B5/59688—Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Control Of Position Or Direction (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
DE69032739T 1989-09-29 1990-09-11 Verfahren und System zur Demodulation von Lagesignalen eines Transducers Expired - Fee Related DE69032739T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/415,053 US5136439A (en) 1989-09-29 1989-09-29 Sectored servo position demodulator system

Publications (2)

Publication Number Publication Date
DE69032739D1 true DE69032739D1 (de) 1998-12-10
DE69032739T2 DE69032739T2 (de) 1999-04-01

Family

ID=23644171

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69032739T Expired - Fee Related DE69032739T2 (de) 1989-09-29 1990-09-11 Verfahren und System zur Demodulation von Lagesignalen eines Transducers

Country Status (6)

Country Link
US (1) US5136439A (de)
EP (1) EP0420440B1 (de)
JP (1) JP2591527B2 (de)
DE (1) DE69032739T2 (de)
HK (1) HK1013172A1 (de)
SG (1) SG48781A1 (de)

Families Citing this family (43)

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Publication number Priority date Publication date Assignee Title
US5210660A (en) * 1990-01-17 1993-05-11 International Business Machines Corporation Sectored servo independent of data architecture
JPH03225679A (ja) * 1990-01-31 1991-10-04 Sony Corp デイスクドライブ装置
JPH06295405A (ja) * 1992-12-18 1994-10-21 Fujitsu Ltd 磁気ディスク装置の書き込み方法及び磁気ディスク装置
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
US5625508A (en) * 1993-08-26 1997-04-29 International Business Machines Corporation Method and apparatus for servo demodulation in a direct access storage device
JP2735791B2 (ja) * 1993-08-26 1998-04-02 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（ｄａｓｄ）内の回転式アクチュエータ弧補償訂正のための方法及び装置
US5576906A (en) * 1994-10-11 1996-11-19 Quantum Corporation Synchronous detection of concurrent servo bursts for fine head position in disk drive
US5847894A (en) * 1994-12-30 1998-12-08 International Business Machines Corporation Disk and storage device having an anti-alias data pattern located on a servo sector
US5760990A (en) * 1995-08-08 1998-06-02 Seagate Technology, Inc. Servo position error signal calibration in a hard disc drive
US5774297A (en) * 1996-03-26 1998-06-30 Seagate Technology, Inc. Dynamic compensation of servo burst measurement offsets in a disc drive
US6046879A (en) * 1996-05-16 2000-04-04 Seagate Technology, Inc. Weighted linearization of a position error signal in a disc drive
US6108152A (en) * 1996-10-01 2000-08-22 Seagate Technology, Inc. Redundant synchronization fields to improve disc drive read performance
US5889631A (en) * 1996-11-19 1999-03-30 Seagate Technology, Inc. Detecting a track tear servo defect condition in a hard disc drive
US5844743A (en) * 1996-12-20 1998-12-01 Seagate Technology, Inc. Velocity sensing using actuator coil back-emf voltage
US6055118A (en) * 1997-01-15 2000-04-25 Seagate Technology, Inc. Holding automatic gain control levels during read error recovery in a disc drive
US6052804A (en) * 1997-01-15 2000-04-18 Seagate Technology, Inc. Data transfer optimization through sector evaluation and reallocation during a disc drive idle mode
US5835300A (en) * 1997-01-30 1998-11-10 Seagate Technology, Inc. Dynamic compensation of servo burst measurement offsets in a disc drive
US5914836A (en) * 1997-03-31 1999-06-22 Seagate Technology, Inc. Cantilevered support for the magnetic circuit of a disc drive voice coil motor
KR20010022948A (ko) * 1997-08-15 2001-03-26 시게이트 테크놀로지 엘엘씨 디스크 드라이브의 균일 밀도 서보 정보
US6084738A (en) * 1997-08-15 2000-07-04 Seagate Technology, Inc. Writing servo information to a disc drive at a constant density
US5978169A (en) * 1997-09-23 1999-11-02 Seagate Technology, Inc. Repeated servo runout error compensation in a disc drive
US6690524B1 (en) 1997-10-16 2004-02-10 Seagate Technology Llc Data recovery in a disc drive with redundant sync data blocks
US6097561A (en) * 1998-03-09 2000-08-01 Seagate Technology, Inc. Data recovery in a disc drive with redundant sync data blocks
US6205569B1 (en) 1997-11-18 2001-03-20 Seagate Technology Llc Error recovery using alternate headers in a disc drive
US6078477A (en) 1998-07-30 2000-06-20 Seagate Technology, Inc. Heat transfer plate for an actuator assembly
US6392831B1 (en) 1998-04-16 2002-05-21 Seagate Technology Llc Identification of defective servo information elements in a disc drive system
US6243224B1 (en) 1998-05-21 2001-06-05 Seagate Technology Llc Asynchronous digital demodulator and method for a null-type servo pattern
US6195220B1 (en) 1998-05-21 2001-02-27 Seagate Technology Llc Method and apparatus utilizing field ratioing demodulation techniques for a null-type servo pattern
US6426845B1 (en) 1998-05-21 2002-07-30 Seagate Technology Llc Asynchronous analog demodulator and method for a null-type servo pattern
US6181505B1 (en) 1998-06-26 2001-01-30 Seagate Technology Llc Synchronous digital demodulator with integrated read and servo channels
US6404582B1 (en) 1998-09-14 2002-06-11 Seagate Technology Llc Robust index reference position detection using a sequence of successively disposed index fields
US6377413B1 (en) 1999-03-26 2002-04-23 Seagate Technology Llc Method and apparatus for encoding identification information on a magnetic disc
US6490117B1 (en) * 1999-03-26 2002-12-03 Seagate Technology Llc Method of thermally printing servo patterns on magnetic media
US6574068B1 (en) 1999-04-21 2003-06-03 Seagate Technology Llc Servo control using continuous position error signal with high order polynomial component
US6490111B1 (en) 1999-08-25 2002-12-03 Seagate Technology Llc Method and apparatus for refreshing servo patterns in a disc drive
JP4475614B2 (ja) * 2000-04-28 2010-06-09 大正製薬株式会社 並列処理方法におけるジョブの割り当て方法および並列処理方法
US6600633B2 (en) 2001-05-10 2003-07-29 Seagate Technology Llc Thermally conductive overmold for a disc drive actuator assembly
US6950270B2 (en) 2002-04-18 2005-09-27 Seagate Technology Llc Adaptive index reference position qualification
US7511912B2 (en) * 2002-11-22 2009-03-31 Seagate Technology Llc Writing multiple servo sector patterns to improve servo sector alignment on multiple surfaces
US7957084B2 (en) * 2008-02-04 2011-06-07 Seagate Technology Llc Extraction of transducer position information from bit patterned magnetic media
US8045282B2 (en) * 2009-02-03 2011-10-25 Seagate Technology Llc Measurement of track eccentricity on bit patterned media
US8625231B1 (en) * 2012-11-08 2014-01-07 HGST Netherlands B.V. Adjusting VGA analog gain for misaligned servo sectors in a disk drive

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2039078B (en) * 1978-12-27 1982-11-24 Ibm Sampled data servo positioning system
US4414589A (en) * 1981-12-14 1983-11-08 Northern Telecom Inc. Embedded servo track following system and method for writing servo tracks
DE3378800D1 (en) * 1982-05-10 1989-02-02 Digital Equipment Corp Continuous-plus-embedded servo data position control system for magnetic disk device
US4590526A (en) * 1983-11-01 1986-05-20 Amcodyne Incorporated Method and apparatus for controlling head movement relative to a disk in an embedded servo system
JPS60193176A (ja) * 1984-03-13 1985-10-01 Toshiba Corp ヘツドの位置決め方式
US4646175A (en) * 1984-04-05 1987-02-24 Irwin Magnetic Systems, Inc. Method and apparatus for positioning transducers by digital conversion of analog-type signals
JPS6159677A (ja) * 1984-08-30 1986-03-27 Fujitsu Ltd ヘツド位置信号のデジタル化方法
JPS6232551A (ja) * 1985-08-05 1987-02-12 Fujitsu Ltd メモリアクセス制御装置
US4669004A (en) * 1986-02-27 1987-05-26 Quantum Corporation High capacity disk file with embedded sector servo
US4679103A (en) * 1986-04-29 1987-07-07 International Business Machines Corporation Digital servo control system for a data recording disk file
US4823212A (en) * 1986-11-26 1989-04-18 Hewlett-Packard Company Sampled servo code format and system for a disc drive

Also Published As

Publication number Publication date
EP0420440B1 (de) 1998-11-04
JPH03283147A (ja) 1991-12-13
SG48781A1 (en) 1998-05-18
HK1013172A1 (en) 1999-08-13
US5136439A (en) 1992-08-04
JP2591527B2 (ja) 1997-03-19
DE69032739T2 (de) 1999-04-01
EP0420440A1 (de) 1991-04-03

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: SEAGATE TECHNOLOGY LLC, SCOTTS VALLEY, CALIF., US

8328 Change in the person/name/address of the agent

Free format text: HENKEL, FEILER & HAENZEL, 81675 MUENCHEN

8339 Ceased/non-payment of the annual fee