KR970060185A - 저장 장치와, 자기저항성 헤드 위치지정 방법과, 열 감응성 보정 방법 - Google Patents

저장 장치와, 자기저항성 헤드 위치지정 방법과, 열 감응성 보정 방법 Download PDF

Info

Publication number
KR970060185A
KR970060185A KR1019960050008A KR19960050008A KR970060185A KR 970060185 A KR970060185 A KR 970060185A KR 1019960050008 A KR1019960050008 A KR 1019960050008A KR 19960050008 A KR19960050008 A KR 19960050008A KR 970060185 A KR970060185 A KR 970060185A
Authority
KR
South Korea
Prior art keywords
head
disk
track
storage device
signal
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.)
Granted
Application number
KR1019960050008A
Other languages
English (en)
Other versions
KR100234651B1 (ko
Inventor
고던 제이 스미스
할 쟐머 오텐센
Original Assignee
포만 제프리 엘
인터내셔널 비지네스 머신즈 코포레이션
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 포만 제프리 엘, 인터내셔널 비지네스 머신즈 코포레이션 filed Critical 포만 제프리 엘
Publication of KR970060185A publication Critical patent/KR970060185A/ko
Application granted granted Critical
Publication of KR100234651B1 publication Critical patent/KR100234651B1/ko
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
    • G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
    • 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
    • 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
    • G11B21/022—Programmed access in sequence to indexed parts of operating record carriers
    • G11B21/025—Programmed access in sequence to indexed parts of operating record carriers of rotating discs
    • 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
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
    • G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
    • G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
    • G11B5/3945—Heads comprising more than one sensitive element
    • 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
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
    • G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
    • G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
    • G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
    • G11B5/3945—Heads comprising more than one sensitive element
    • G11B5/3948—Heads comprising more than one sensitive element the sensitive elements being active read-out elements
    • G11B5/3958—Heads comprising more than one sensitive element the sensitive elements being active read-out elements the active elements being arranged in a single plane, e.g. "matrix" disposition
    • 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
    • G11B5/59683—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 for magnetoresistive heads
    • 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
    • G11B5/60—Fluid-dynamic spacing of heads from record-carriers
    • G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
    • G11B5/6011—Control of flying height
    • G11B5/6029—Measurement using values derived from the data signal read from the disk
    • 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
    • G11B2005/0002—Special dispositions or recording techniques
    • 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
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • 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
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/0021—Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Magnetic Heads (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

본 발명은 저장 장치의 저장 매체에 대한 자기저항성 헤드(magnetoresistive(MR) head)를 위치지정하는 방법 및 장치에 관한 것이다. MR 헤드는 제1 및 제2 MR 소자를 갖는다. 저장 매체는 MR 헤드와 저장 매체간에 상대적인 이동이 허용되도록 저장 장치내에 장착된다. 저장 매체는 MR 헤드의 제1 및 제2열 응답(thermal response)을 유도(induce)하기 위해 제공된 서보 정보(servo information)를 포함한다. 제어기는 MR 헤드와 접속되고, MR 소자의 제1 및 제2열 응답을 사용하여 MR 헤드와 저장 매체간의 상대적 이동을 제어한다.

Description

저장 장치와, 자기저항성 헤드 위치지정 방법과, 열 감응성 보정 방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 상부 하우징 덮개가 제거된 데이타 저장 시스템의 평면도.

Claims (32)

  1. 저장 장치(a storage device)에 있어서, ① 제1 및 제2 MR 소자가 구비된 자기저항성 헤드(a magnetoresistive) (MR) head)와, ② 저장 매체(a storage medium)로서, 상기 MR 헤드와 상기 저장 매체간에 상대적 이동이 허용되도록 장착되고, 상기 MR 소자의 제1 및 제2열 응답(first and second thermal reponses)을 발생하기 위해 제공된 서보 정보를 포함하는 상기 저장 매체와, ③ 상기 MR 헤드에 접속되고, 상기 제1 및 제2열 응답을 사용하여 상기 MR 헤드와 상기 저장 매체간에 상대적 이동을 제공하는데 제공되는 제어기를 포함하는 저장 장치.
  2. 제1항에 있어서, 상기 저장 매체는 자기 디스크(a magnetic disk)를 포함하는 저장 장치.
  3. 제2항에 있어서, 상기 서보 정보는 상기 자기 디스크의 표면 프로파일 변동(surface profile variations)을 포함하는 저장 장치.
  4. 제3항에 있어서, 상기 디스크는 상기 표면 프로파일 변동에 의해 분리되는 트랙(tracks)을 포함하는 저장 장치.
  5. 제1항에 있어서, 상기 제1 및 제2MR 소자는 서로 인접하여 위치되는 저장 장치.
  6. 제1항에 있어서, 상기 제어기는 상기 제1 및 제2열 신호로부터 발생된 열 위치 에러신호(a thermal position error signal(PES))에 응답하는 저장 장치.
  7. 제6항에 있어서, 상기 열 위치 에러 신호는 선형 신호(a linear signal)인 저장 장치.
  8. 제7항에 있어서, 상기 열 위치 에러 신호(PES)는 다음과 같은 수식 즉, PES= 의 수식(여기서, t1은 상기 제1열 응답 신호의 함수를 나타내고, t2는 상기 제2열 응답 신호의 함수를 나타냄)에 의해 결정되는 저장 장치.
  9. 제6항에 있어서, 상기 위치 에러 신호를 발생하는 복조기 및 적응적 보정기(a demodulator and adaptive calibrator)를 포함하는 저장 장치.
  10. 두개의 MR 소자가 구비된 자기저항성(MR) 헤드를 갖는 저장 장치와, 상기 MR 소자에서 유도된 열 신호에 응답하여 상기 MR 헤드를 위치지정하는 서보 제어 시스템(a servo control system)에 사용하는 디스크에 있어서, 트랙 표시기(track markers)에 의해 분리되는 다수의 트랙으로서, 상기 트랙 표시기는 상기 서보 시스템에 의해 열적으로 검출가능한, 상기 다수의 트랙을 포함하는 디스크.
  11. 제10항에 있어서, 상기 트랙 표시기는 지형 변동(topographical variations)을 포함하는 디스크.
  12. 제11항에 있어서, 상기 지형 변동은 원주형 홈(circumferential grooves)을 포함하는 디스크.
  13. 제10항에 있어서, 상기 트랙 표시기는 상기 트랙의 열 방사율(thermal emissivity)과 다른 열 열 방사율을 갖는 디스크.
  14. 제10항에 있어서, 상기 트랙 표시기를 교차(intersect)하는 섹터 표시기(sector markers)를 더 포함하고, 각각이 상기 섹터 표시기의 적어도 일부는 열적으로 검출가능한 디스크.
  15. 제14항에 있어서, 상기 섹터 표시기는 방사형 홈(radial grooves)인 디스크.
  16. 제10항에 있어서, 보정 트랙(a calibration track)으로서, 상기 MR 소자가 상기 보정 트랙 상의 중심에 위치될 때 상기 MR 소자가 상기 트랙 표시기를 검출할 수 없을만큼 충분한 넓이의 폭을 갖는, 상기 보정 트랙을 더 포함하는 디스크.
  17. 제16항에 있어서, 열 검출하는데 충분한 넓이의 상기 보정 트랙폭을 갖는 섹터 표시기를 더 포함하는 디스크.
  18. 제15항에 있어서, 상기 섹터 표시기는 50-100 미크론(microns)의 상기 보정 트랙의 폭을 갖는 디스크.
  19. 한쌍의 MR 소자가 구비된 자기 저항성(MR) 헤드를 위치지정하는 방법에 있어서, ① 상기 MR 소자에서 제1 및 제2열 신호를 유도(induce)하는 단계와, ② 상기 제1 및 제2 열 신호에 응답하여 상기 MR 헤드를 이동시키는 단계를 포함하는 자기저항성 헤드 위치지정 방법.
  20. 제19항에 있어서, 상기 제1 및 제2 열 신호에 기초하여 위치 에러 신호(PES 신호)를 발생하는 단계를 더 포함하고, 상기 MR 헤드의 상기 이동 단계는 상기 PES 신호에 응답하여 수행되는 자기저항성 헤드 위치지정 방법.
  21. 제20항에 있어서, 상기 제1 및 제2열 신호를 보정하는 단계를 더 포함하고, 상기 이동 단계는 상기 보정된 제1 및 제2열 신호에 응답하는 자기저항성 헤드 위치저장 방법.
  22. 제20항에 있어서, 상기 이동 단계는 액츄에이터(an actuator)를 상기 PES 신호에 응답하는 구동기와 구동하는 단계를 더 포함하는 자기저항성 헤드 위치지정 방법.
  23. 제19항에 있어서, ① 상기 MR 소자에서 제1 및 제2자기 신호(first and second magnetic signals)를 유도하는 단계와, ② 상기 제1 및 제2자기 신호에 응답하여 스핀들 모터(a spindle motor)를 구동(drive)시키는 단계를 포함하는 자기저항성 헤드 위치지정 방법.
  24. 제23항에 있어서, 상기 구동 단계는 상기 제1 및 제2자기 신호로부터 차분 타이밍 신호(a differential timing signal)를 발생하는 단계를 더 포함하는 자기저항성 헤드 위치지정 방법.
  25. 제23항에 있어서, 상기 제1 및 제2자기 신호는 데이타 채널(a data channel) 사용에 의해 처리되는 자기저항성 헤드 위치지정 방법.
  26. 적어도 하나의 디스크 및 적어도 하나의 MR 헤드를 갖는 저장 시스템에서 MR 헤드의 두개의 자기저항성(MR) 소지의 열 감응성(thermal sensitivity)을 보정(calibrate)하는 방법에 있어서, ① 상기 MR 헤드를 보정 트랙에 이동시키는 단계와, ② 상기 MR 소자에서 제1 및 제2 열 신호를 유도하는 단계와, ③ 상기 제1 및 제2 열 신호가 동일하도록 상기 제1 및 제2 열 신호의 이득을 조정하는 단계를 포함하는 열 감응성 보정 방법.
  27. 제26항에 있어서, 상기 유도 단계는 상기 보정된 트랙 주위에 제공된 섹터 표시기상에 상기 MR 헤드를 통과시키는 단계를 포함하는 열 감응성 보정 방법.
  28. 제26항에 있어서, 상기 열 신호의 제1 및 제2 피크 진폭(first and second peak amplitudes)을 결정(determine)하는 단계를 더 포함하고, 상기 조정 단계를 상기 제1 및 제2 피크 진폭의 이득을 조정하는 단계를 포함하는 열 감응성 보정 방법.
  29. 제26항에 있어서, 보정을 위해 MR 헤드를 선택하는 단계를 더 포함하는 열 감응성 보정 방법.
  30. 제26항에 있어서, 상기 조정 단계는 승산기(muitipliers)에 의해 상기 제1 및 제2 열 신호를 승산하는 단계를 포함하고, 상기 승산기는 랜덤 액세스 메모리(a random access memory)에 저장되는 열 감응성 보정 방법.
  31. 제26항에 있어서, ① 제1트랙의 인덱스 표시기를 식별하는 단계와, ② 제2디스크의 인덱스 표시기를 식별하는 단계와, ③ 상기 제1디스크 인덱스 표시기 식별과 상기 제2디스크 엔덱스 표시기 식별간의 시간차를 측정(measure)하는 단계를 더 포함하는 열 감응성 보정 방법.
  32. 제31항에 있어서, 상기 식별 단계 및 상기 측정 단계는 상기 유도 단계와 동시에 수행되는 열 감응성 보정 방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019960050008A 1996-01-02 1996-10-30 저장 장치와, 자기저항성 헤드 위치지정 방법과,열 감응성 보정 방법 Expired - Fee Related KR100234651B1 (ko)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/582,555 US5872676A (en) 1996-01-02 1996-01-02 Method and apparatus for positioning a dual element magnetoresistive head using thermal signals
US8/582,555 1996-01-02
US08/582,555 1996-01-02

Publications (2)

Publication Number Publication Date
KR970060185A true KR970060185A (ko) 1997-08-12
KR100234651B1 KR100234651B1 (ko) 2000-01-15

Family

ID=24329597

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019960050008A Expired - Fee Related KR100234651B1 (ko) 1996-01-02 1996-10-30 저장 장치와, 자기저항성 헤드 위치지정 방법과,열 감응성 보정 방법

Country Status (8)

Country Link
US (3) US5872676A (ko)
EP (1) EP0783165B1 (ko)
JP (1) JP3645054B2 (ko)
KR (1) KR100234651B1 (ko)
CN (1) CN1073732C (ko)
DE (1) DE69619785T2 (ko)
HU (1) HUP9902253A3 (ko)
SG (1) SG48490A1 (ko)

Families Citing this family (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6122131A (en) * 1997-09-12 2000-09-19 Quantum Corporation Adaptively-controlled disk drive assembly
US6934098B2 (en) * 1998-04-09 2005-08-23 Dcard, Inc. Data card with a full circular track for alignment and amplitude calibration
US6456213B1 (en) * 1998-06-11 2002-09-24 Seagate Technology Llc Digitizing readback waveform for testing hard disc drives
US6480353B1 (en) * 1999-02-22 2002-11-12 Seagate Technology Llc Fixed disc drive cartridge and playback device
US6438025B1 (en) * 1999-09-08 2002-08-20 Sergei Skarupo Magnetic memory device
US6747824B1 (en) * 2000-05-26 2004-06-08 Hitachi Global Storage Technologies Netherlands, B.V. Method and apparatus for head crash predictive failure analysis based upon slider track misregistration measurement using the readback signal
US6940669B2 (en) * 2000-06-20 2005-09-06 Seagate Technology Llc Wide write head with thermal asperity detector and method of using the same
EP1176590B1 (en) * 2000-07-27 2006-06-07 Hitachi Global Storage Technologies Netherlands B.V. Head suspension for disk-based data storage apparatus
DE60120287T2 (de) 2000-07-27 2007-06-06 Hitachi Global Storage Technologies Netherlands B.V. Kopfaufhängungsvorrichtung für Gerät zur Datenaufzeichnung auf Platten
US6798594B2 (en) 2000-10-10 2004-09-28 Seagate Technology Llc Position sensing system for a disc drive using micro-servo sectors and side-by-side R/W recording elements
US6751060B2 (en) * 2000-12-05 2004-06-15 Imation Corp. Magnetic media with readable topographical features
US6628598B2 (en) 2000-12-05 2003-09-30 Imation Corp. Patterned media system
US6724550B2 (en) 2001-01-23 2004-04-20 Seagate Technology Llc Adaptive dampening of thermal asperity events in disc drives
US6657809B2 (en) 2001-01-29 2003-12-02 International Business Machines Corporation Method and apparatus for positioning a transducer using a phase difference in surface profile variations on a storage medium
US6762899B2 (en) 2001-03-16 2004-07-13 Hitachi Global Storage Technologies Netherlands B.V. Method and apparatus for estimating the flyheight of an airbearing slider in a storage device using variable spindle velocity
US6785079B2 (en) 2001-03-16 2004-08-31 Hitachi Global Storage Technologies Netherlands B.V. Method and apparatus for estimating the flyheight of an airbearing slider in a storage device
US6865040B2 (en) * 2001-05-22 2005-03-08 Seagate Technology, Llc Method and system for measuring fly height
US6671790B2 (en) 2001-06-04 2003-12-30 Seagate Technology Llc Optimizing reader to writer offset compensation for a disc drive
US6956707B2 (en) * 2002-05-07 2005-10-18 Hitachi Global Storage Technologies Netherlands B.V. Method for look-ahead thermal sensing in a data storage device
US7027263B2 (en) * 2002-05-07 2006-04-11 Hitachi Global Storage Technologies Netherlands B.V. Apparatus for look-ahead thermal sensing in a data storage device
KR101077850B1 (ko) * 2002-12-30 2011-10-31 코닌클리케 필립스 일렉트로닉스 엔.브이. 광 디스크 재생장치
US7092194B2 (en) * 2003-02-07 2006-08-15 Meyer Dallas W Method of calibrating magnetic storage medium bi-directional recording head
JP2004265542A (ja) * 2003-03-03 2004-09-24 Fuji Electric Holdings Co Ltd 磁気転写用マスタディスク、および、該マスタディスクの製造方法
US7369369B1 (en) 2003-04-03 2008-05-06 Meyer Dallas W Bidirectional micropositioning recording head for a magnetic storage device
JP2005004917A (ja) 2003-06-13 2005-01-06 Hitachi Ltd 垂直磁気記録媒体及び磁気ディスク装置
US7538983B1 (en) * 2003-07-29 2009-05-26 Meyer Dallas W Micropositioner recording head for a magnetic storage device
JP4099180B2 (ja) * 2005-07-11 2008-06-11 Ｔｄｋ株式会社 磁気記録再生装置
US7405898B2 (en) * 2006-06-14 2008-07-29 International Business Machines Corporation System and method for generating a position error signal (PES) reference curve in a data storage device
JP2008159205A (ja) * 2006-12-26 2008-07-10 Fujitsu Ltd 記憶装置、記憶装置用ヘッドの異常検出方法、異常検出プログラム
US7489472B2 (en) * 2007-01-24 2009-02-10 Maxtor Corporation High-order hybrid actuator controller
US7609469B2 (en) * 2007-06-29 2009-10-27 Seagate Technology Llc Alternative sensors for tracking and timing in bit patterned media
US7885025B2 (en) * 2008-10-22 2011-02-08 Seagate Technology Llc Generating PES using readback signal distortion
US8279559B1 (en) 2009-01-02 2012-10-02 Meyer Dallas W Process for creating discrete track magnetic recording media including an apparatus having a stylus selectively applying stress to a surface of the recording media
US8139301B1 (en) 2009-07-22 2012-03-20 Western Digital (Fremont), Llc Disk drive comprising a dual read element and delay circuitry to improve read signal
US8169726B2 (en) 2010-07-19 2012-05-01 Lsi Corporation Disk file preamplifier frequency-response and time delay compensation
KR20120082736A (ko) 2011-01-14 2012-07-24 삼성모바일디스플레이주식회사 유기 전계발광 표시 장치
US20140063644A1 (en) * 2012-08-29 2014-03-06 Seagate Technology Llc Magnetic Element with Multiple Selective Transducing Elements
US9431039B1 (en) 2013-05-21 2016-08-30 Western Digital (Fremont), Llc Multiple sensor array usable in two-dimensional magnetic recording
US8891207B1 (en) 2013-06-07 2014-11-18 Western Digital (Fremont), Llc Connection schemes for a multiple sensor array usable in two-dimensional magnetic recording
US8908333B1 (en) 2013-08-13 2014-12-09 Western Digital (Fremont), Llc Shield designed for middle shields in a multiple sensor array
US9431032B1 (en) 2013-08-14 2016-08-30 Western Digital (Fremont), Llc Electrical connection arrangement for a multiple sensor array usable in two-dimensional magnetic recording
US9047205B1 (en) 2013-08-15 2015-06-02 Western Digital Technologies, Inc. Data storage device employing orthogonal equalization and sequence detection to compensate for two-dimensional intersymbol interference
US9147419B2 (en) 2013-09-30 2015-09-29 Marvell World Trade Ltd. Generating position error signal based on data tracks for magnetic data storage
US9123369B2 (en) 2013-09-30 2015-09-01 Marvell World Trade Ltd. Method and apparatus for determining position of multiple drive heads
US9135935B1 (en) 2013-10-11 2015-09-15 Western Digital Technologies, Inc. Customized head gimbal assembly bonding skew angle for adjusting two-dimensional magnetic recording reader alignment
US9042058B1 (en) 2013-10-17 2015-05-26 Western Digital Technologies, Inc. Shield designed for middle shields in a multiple sensor array
US9245578B1 (en) 2013-11-26 2016-01-26 Western Digital Technologies, Inc. Disk drive compensating for inter-track interference in analog read signal
US9257145B1 (en) 2013-11-27 2016-02-09 Western Digital Technologies, Inc. Disk drive measuring down-track spacing of read sensors
US8988812B1 (en) 2013-11-27 2015-03-24 Western Digital (Fremont), Llc Multi-sensor array configuration for a two-dimensional magnetic recording (TDMR) operation
US8970988B1 (en) 2013-12-31 2015-03-03 Western Digital (Fremont), Llc Electric gaps and method for making electric gaps for multiple sensor arrays
US9257146B1 (en) 2014-02-11 2016-02-09 Western Digital Technologies, Inc. Data storage device comprising sequence detector compensating for inter-track interference
US9396745B2 (en) 2014-03-07 2016-07-19 Seagate Technology Llc Multi-sensor reader with different readback sensitivities
US9070406B1 (en) 2014-03-10 2015-06-30 Western Digital Technologies, Inc. Disk drive configuring one-dimensional and two-dimensional recording areas based on read element spacing
US9245556B2 (en) 2014-03-10 2016-01-26 Western Digital Technologies, Inc. Disk drive employing multiple read elements to increase radial band for two-dimensional magnetic recording
US8947812B1 (en) 2014-03-27 2015-02-03 Western Digital Technologies, Inc. Data storage device comprising equalizer filter and inter-track interference filter
US9053727B1 (en) 2014-06-02 2015-06-09 Western Digital Technologies, Inc. Disk drive opening spiral crossing window based on DC and AC spiral track error
US9013824B1 (en) 2014-06-04 2015-04-21 Western Digital Technologies, Inc. Data storage device comprising dual read sensors and dual servo channels to improve servo demodulation
US9025267B1 (en) 2014-06-09 2015-05-05 Western Digital Technologies, Inc. Data storage device using branch metric from adjacent track to compensate for inter-track interference
US9013821B1 (en) 2014-06-10 2015-04-21 Western Digital Technologies, Inc. Data storage device employing one-dimensional and two-dimensional channels
US9087527B1 (en) 2014-10-28 2015-07-21 Western Digital (Fremont), Llc Apparatus and method for middle shield connection in magnetic recording transducers
US9786301B1 (en) 2014-12-02 2017-10-10 Western Digital (Fremont), Llc Apparatuses and methods for providing thin shields in a multiple sensor array
US9183877B1 (en) 2015-03-20 2015-11-10 Western Digital Technologies, Inc. Data storage device comprising two-dimensional data dependent noise whitening filters for two-dimensional recording
US11557319B1 (en) 2021-08-24 2023-01-17 Seagate Technology Llc Read offset calibration for error recovery
US11568895B1 (en) 2021-09-03 2023-01-31 Seagate Technology Llc Read offset calibration for error recovery

Family Cites Families (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416373A (en) * 1966-04-01 1968-12-17 Ralph J. Havens Displacement detector
NL7309590A (nl) * 1973-07-10 1975-01-14 Philips Nv Inrichting voor het sturen van de positie van een magneetkop ten opzichte van een te volgen informatiespoor.
DE3045401A1 (de) * 1980-12-02 1982-07-01 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zum pruefen von einspritzduesen
JPS57167172A (en) * 1981-04-07 1982-10-14 Victor Co Of Japan Ltd High density information recording and reproducing system
US4498146A (en) * 1982-07-30 1985-02-05 At&T Bell Laboratories Management of defects in storage media
US4485337A (en) * 1983-05-09 1984-11-27 Control Data Corporation Servo data driven motor speed control
US4532802A (en) * 1984-05-31 1985-08-06 International Business Machines Corporation Apparatus for analyzing the interface between a recording disk and a read-write head
CA1248222A (en) * 1984-08-27 1989-01-03 Yutaka Souda Magnetic transducer head utilizing magnetoresistance effect
US4647992A (en) * 1984-11-26 1987-03-03 International Business Machines Corporation Combined magnetic channel signal sensor and servo control track following system and method
JPS61177622A (ja) * 1985-01-31 1986-08-09 Matsushita Electric Ind Co Ltd 磁気デイスク装置
US4669011A (en) * 1985-05-03 1987-05-26 Eastman Kodak Company Slider assembly with dynamically positionable transducer
US4811133A (en) * 1985-05-22 1989-03-07 Fuji Photo Film Co., Ltd. Electronic still video record/play head positioner having both open and closed loop positioning control
US4712144A (en) * 1985-08-20 1987-12-08 International Business Machines Corporation Method and apparatus for reading recorded data by a magnetoresistive head
JPS6256849A (ja) * 1985-09-06 1987-03-12 Snow Brand Milk Prod Co Ltd 通電加熱法に用いられるセンサ−
DE3578017D1 (de) * 1985-11-19 1990-07-05 Ibm Verfahren und vorrichtung zur regelung der flughoehe des kopfes in einem magnetspeicher.
JPS62250570A (ja) * 1986-04-22 1987-10-31 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション 記憶装置用変換器
US4747698A (en) * 1986-04-30 1988-05-31 International Business Machines Corp. Scanning thermal profiler
US4777544A (en) * 1986-08-15 1988-10-11 International Business Machine Corporation Method and apparatus for in-situ measurement of head/recording medium clearance
US4802033A (en) * 1986-11-07 1989-01-31 Eastman Kodak Company Predictive positioning offset compensation for high TPI disk systems
JPH0777015B2 (ja) * 1987-01-23 1995-08-16 松下電器産業株式会社 磁気デイスク装置
JPS63191316A (ja) * 1987-02-03 1988-08-08 Matsushita Electric Ind Co Ltd 磁気記録媒体
JPH0198180A (ja) * 1987-10-09 1989-04-17 Mitsubishi Electric Corp 記憶装置
US4931887A (en) * 1988-02-01 1990-06-05 International Business Machines Corporation Capacitive measurement and control of the fly height of a recording slider
US5084791A (en) * 1988-05-10 1992-01-28 Quantum Corporation Head position control system for fixed drive including position encoder, temperature sensor and embedded fine servo information
US4949036A (en) * 1988-07-07 1990-08-14 Seagate Technology, Inc. Disc drive error mapping using threshold comparison methods
US4914398A (en) * 1988-08-01 1990-04-03 International Business Machines Corporation Method and circuitry to suppress additive disturbances in data channels containing MR sensors
US5070495A (en) * 1989-04-12 1991-12-03 International Business Machines Corporation Write calibration for magnetooptic disk recorders
DE69024255T2 (de) * 1989-05-11 1996-05-15 Mitsubishi Electric Corp Defektprüfvorrichtung für scheibenförmigen Datenaufzeichnungsträger
US5067039A (en) * 1989-10-20 1991-11-19 Insite Peripherals, Inc. High track density magnetic media with pitted optical servo tracks and method for stamping the tracks on the media
US5054936A (en) * 1989-11-16 1991-10-08 Jacob Fraden Sensor for active thermal detection
US5032935A (en) * 1989-12-12 1991-07-16 International Business Machines Corporation Amplification of signals produced by a magnetoresistive element
US5057785A (en) * 1990-01-23 1991-10-15 International Business Machines Corporation Method and circuitry to suppress additive disturbances in data channels
US5079663A (en) * 1990-01-29 1992-01-07 International Business Machines Corporation Magnetoresistive sensor with track following capability
US5418770A (en) * 1990-06-29 1995-05-23 Hitachi, Ltd. Method of and apparatus for correcting edge interval of pit in optical recording/read-out apparatus
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
JPH0495218A (ja) * 1990-08-10 1992-03-27 Matsushita Electric Ind Co Ltd 磁気ディスクおよびこれを用いた磁気ディスク装置
US5255136A (en) * 1990-08-17 1993-10-19 Quantum Corporation High capacity submicro-winchester fixed disk drive
JPH04109421A (ja) * 1990-08-30 1992-04-10 Fujitsu Ltd 磁気ディスク装置
KR920007176B1 (ko) * 1990-09-07 1992-08-27 삼성전관 주식회사 플라즈마 표시소자
US5185681A (en) * 1990-09-28 1993-02-09 Seagate Thermal offset compensation for high density disk drives
JPH04141822A (ja) * 1990-10-02 1992-05-15 Fujitsu Ltd 磁気ディスクおよび磁気ディスク装置
US5220476A (en) * 1990-11-02 1993-06-15 Godwin Jimmy D Non-erasable magnetic data storage method
US5168413A (en) * 1990-11-30 1992-12-01 Ibm Corporation Transducer head flying height monitoring methods and apparatus for disk drive system
JP3166181B2 (ja) * 1991-02-28 2001-05-14 株式会社日立製作所 磁気記憶装置
JP3108814B2 (ja) * 1991-03-07 2000-11-13 富士通株式会社 磁気ディスク装置
US5233482A (en) * 1991-07-31 1993-08-03 International Business Machines Corporation Thermal asperity compensation for PRML data detection
JPH05174515A (ja) * 1991-12-20 1993-07-13 Fujitsu Ltd 磁気ヘッドの位置決め方法およびその装置
JP3254743B2 (ja) * 1992-08-17 2002-02-12 ソニー株式会社 位置決め信号の書き込み方法
US5341249A (en) * 1992-08-27 1994-08-23 Quantum Corporation Disk drive using PRML class IV sampling data detection with digital adaptive equalization
US5321559A (en) * 1992-08-27 1994-06-14 Quantum Corporation Asynchronous peak detection of information embedded within PRML class IV sampling data detection channel
US5327298A (en) * 1992-09-10 1994-07-05 International Business Machines Corporation Noise minimization for magnetic data storage drives using oversampling techniques
JPH06111502A (ja) * 1992-09-30 1994-04-22 Sony Corp 磁気ディスク装置
US5377058A (en) * 1992-12-31 1994-12-27 International Business Machines Corporation Fly height servo control of read/write head suspension
US5301080A (en) * 1992-12-31 1994-04-05 International Business Machines Corporation Bias servo loop for magneto-resistive read/write head
US5424885A (en) * 1993-01-11 1995-06-13 Seagate Technology, Inc. Method for following data tracks in a disc drive using an improved thermal calibration method
US5455730A (en) * 1993-02-18 1995-10-03 International Business Machines Corporation Contact magnetic recording disk file with a magnetoresistive read sensor
JP3344495B2 (ja) * 1993-03-04 2002-11-11 ソニー株式会社 磁気ディスク装置
JPH06290563A (ja) * 1993-03-31 1994-10-18 Hoya Corp 磁気ヘッド及び磁気記録・再生装置
JP2879185B2 (ja) * 1993-04-16 1999-04-05 ティーディーケイ株式会社 光磁気ディスク
US5367409A (en) * 1993-04-29 1994-11-22 International Business Machines Corporation Even harmonic distortion compensation for digital data detection
US5810477A (en) * 1993-04-30 1998-09-22 International Business Machines Corporation System for identifying surface conditions of a moving medium
US5527110A (en) * 1993-04-30 1996-06-18 International Business Machines Corporation Method and apparatus for detecting asperities on magnetic disks using thermal proximity imaging
US5388014A (en) * 1993-09-10 1995-02-07 Hewlett-Packard Company Apparatus and method of sensing the position of a magnetic head
US5739972A (en) * 1996-01-02 1998-04-14 Ibm Method and apparatus for positioning a magnetoresistive head using thermal response to servo information on the record medium
US5806978A (en) * 1996-11-21 1998-09-15 International Business Machines Corporation Calibration apparatus and methods for a thermal proximity sensor

Also Published As

Publication number Publication date
HUP9902253A3 (en) 2004-04-28
EP0783165A3 (en) 1998-01-14
HUP9902253A2 (hu) 1999-10-28
EP0783165B1 (en) 2002-03-13
SG48490A1 (en) 1998-04-17
US5872676A (en) 1999-02-16
CN1156874A (zh) 1997-08-13
DE69619785T2 (de) 2003-03-13
CN1073732C (zh) 2001-10-24
US6154335A (en) 2000-11-28
KR100234651B1 (ko) 2000-01-15
DE69619785D1 (de) 2002-04-18
JPH09198620A (ja) 1997-07-31
US6002539A (en) 1999-12-14
EP0783165A2 (en) 1997-07-09
JP3645054B2 (ja) 2005-05-11

Similar Documents

Publication Publication Date Title
KR970060185A (ko) 저장 장치와, 자기저항성 헤드 위치지정 방법과, 열 감응성 보정 방법
US4558383A (en) Information storage disk transducer position control system using a prerecorded servo pattern requiring no alignment with the storage disk
US5867353A (en) Off-track PES calibration for a magneto-resistive element
US7477470B2 (en) Controlling head flying height based on head heater resistance
US5901001A (en) Detection of asperities in recording surface of storage medium
US7158325B1 (en) Disk drive head touchdown detection with improved discrimination
US5500776A (en) Self-calibration for computer disk read/write offsets
US5838514A (en) Method and apparatus for calibrating a thermal response of a magnetoresistive transducer
KR960025626A (ko) 헤드의 판독 소자 및 기록 소자간 간격 결정 방법과 데이타 배치시의 조직적 에러 정정 방법 및 자기 서보 기록 방법
US7511914B2 (en) Fly height compensation using temperature and non-repeatable runouts
US6671232B1 (en) Method and apparatus for measuring the surface temperature of a disk
US5210662A (en) Tracking control apparatus for magnetic disk
GB2326755A (en) Method of establishing the capacity of a hard disk drive
US6043951A (en) Method, apparatus, and magnetic disk for optimizing off-track position of a magnetoresistive head
KR19990022303A (ko) 자기 저항 헤드 차동 마이크로 조그
KR100238672B1 (ko) 자기저항헤드를 위해 독출 및 기록 스큐 오프셋정보를 제공하는 장치 및 방법
KR100416604B1 (ko) 하드 디스크 드라이브의 서보 패턴상에 결함을 갖는 서보섹터를 검출 및 관리하는 방법 및 장치
US6574066B1 (en) Time-based optical servo system and method
KR100212984B1 (ko) 위치에러신호를 정확히 측정하기 위한 방법
KR100897562B1 (ko) 하드디스크 드라이브, 하드디스크 드라이브의 자기 헤드의부상높이 제어 방법 및 그 방법을 수행하는 컴퓨터프로그램을 기록한 기록매체
US6078461A (en) In situ offset correction for position error signal
KR880002171A (ko) 기록 데이타 재생장치
US10847180B1 (en) Clearance control using actuation efficiency
KR100208720B1 (ko) 서보 정보를 생성하기 위한 장치 및 방법
KR100223633B1 (ko) 하드 디스크 드라이브에서 헤드속도 측정을 이용한 안정 기록방법

Legal Events

Date Code Title Description
PA0109 Patent application

St.27 status event code: A-0-1-A10-A12-nap-PA0109

R17-X000 Change to representative recorded

St.27 status event code: A-3-3-R10-R17-oth-X000

A201 Request for examination
P11-X000 Amendment of application requested

St.27 status event code: A-2-2-P10-P11-nap-X000

P13-X000 Application amended

St.27 status event code: A-2-2-P10-P13-nap-X000

PA0201 Request for examination

St.27 status event code: A-1-2-D10-D11-exm-PA0201

PG1501 Laying open of application

St.27 status event code: A-1-1-Q10-Q12-nap-PG1501

R17-X000 Change to representative recorded

St.27 status event code: A-3-3-R10-R17-oth-X000

R18-X000 Changes to party contact information recorded

St.27 status event code: A-3-3-R10-R18-oth-X000

R18-X000 Changes to party contact information recorded

St.27 status event code: A-3-3-R10-R18-oth-X000

R18-X000 Changes to party contact information recorded

St.27 status event code: A-3-3-R10-R18-oth-X000

E701 Decision to grant or registration of patent right
PE0701 Decision of registration

St.27 status event code: A-1-2-D10-D22-exm-PE0701

GRNT Written decision to grant
PR0701 Registration of establishment

St.27 status event code: A-2-4-F10-F11-exm-PR0701

PR1002 Payment of registration fee

St.27 status event code: A-2-2-U10-U11-oth-PR1002

Fee payment year number: 1

PG1601 Publication of registration

St.27 status event code: A-4-4-Q10-Q13-nap-PG1601

PR1001 Payment of annual fee

St.27 status event code: A-4-4-U10-U11-oth-PR1001

Fee payment year number: 4

PR1001 Payment of annual fee

St.27 status event code: A-4-4-U10-U11-oth-PR1001

Fee payment year number: 5

S17-X000 Non-exclusive voluntary license recorded

St.27 status event code: A-4-4-S10-S17-lic-X000

PN2301 Change of applicant

St.27 status event code: A-5-5-R10-R11-asn-PN2301

PN2301 Change of applicant

St.27 status event code: A-5-5-R10-R14-asn-PN2301

R18-X000 Changes to party contact information recorded

St.27 status event code: A-5-5-R10-R18-oth-X000

PR1001 Payment of annual fee

St.27 status event code: A-4-4-U10-U11-oth-PR1001

Fee payment year number: 6

R18-X000 Changes to party contact information recorded

St.27 status event code: A-5-5-R10-R18-oth-X000

PR1001 Payment of annual fee

St.27 status event code: A-4-4-U10-U11-oth-PR1001

Fee payment year number: 7

R18-X000 Changes to party contact information recorded

St.27 status event code: A-5-5-R10-R18-oth-X000

R18-X000 Changes to party contact information recorded

St.27 status event code: A-5-5-R10-R18-oth-X000

PR1001 Payment of annual fee

St.27 status event code: A-4-4-U10-U11-oth-PR1001

Fee payment year number: 8

PR1001 Payment of annual fee

St.27 status event code: A-4-4-U10-U11-oth-PR1001

Fee payment year number: 9

FPAY Annual fee payment

Payment date: 20080902

Year of fee payment: 10

PR1001 Payment of annual fee

St.27 status event code: A-4-4-U10-U11-oth-PR1001

Fee payment year number: 10

R18-X000 Changes to party contact information recorded

St.27 status event code: A-5-5-R10-R18-oth-X000

R18-X000 Changes to party contact information recorded

St.27 status event code: A-5-5-R10-R18-oth-X000

LAPS Lapse due to unpaid annual fee
PC1903 Unpaid annual fee

St.27 status event code: A-4-4-U10-U13-oth-PC1903

Not in force date: 20090919

Payment event data comment text: Termination Category : DEFAULT_OF_REGISTRATION_FEE

PC1903 Unpaid annual fee

St.27 status event code: N-4-6-H10-H13-oth-PC1903

Ip right cessation event data comment text: Termination Category : DEFAULT_OF_REGISTRATION_FEE

Not in force date: 20090919