GB2341481A - Disc drive with robust track following servo controller - Google Patents

Disc drive with robust track following servo controller

Info

Publication number
GB2341481A
GB2341481A GB9928819A GB9928819A GB2341481A GB 2341481 A GB2341481 A GB 2341481A GB 9928819 A GB9928819 A GB 9928819A GB 9928819 A GB9928819 A GB 9928819A GB 2341481 A GB2341481 A GB 2341481A
Authority
GB
United Kingdom
Prior art keywords
track following
disc drive
disc
servo controller
actuator
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.)
Withdrawn
Application number
GB9928819A
Other versions
GB9928819D0 (en
Inventor
John C Morris
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 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 LLC filed Critical Seagate Technology LLC
Publication of GB9928819D0 publication Critical patent/GB9928819D0/en
Publication of GB2341481A publication Critical patent/GB2341481A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
    • G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B21/00—Systems involving sampling of the variable controlled
    • G05B21/02—Systems involving sampling of the variable controlled electric
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B5/00—Anti-hunting arrangements
    • G05B5/01—Anti-hunting arrangements electric
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/28—Speed controlling, regulating, or indicating
    • 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
    • G11B5/4806—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 specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
    • 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
    • G11B5/5552—Track change, selection or acquisition by displacement of the head across disk tracks using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means
    • 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
    • G11B5/5582—Track change, selection or acquisition by displacement of the head across disk tracks system adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2508—Magnetic discs

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Medical Informatics (AREA)
  • Software Systems (AREA)
  • Evolutionary Computation (AREA)
  • Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

A servo system in a disc drive (110) provides robust servo control during track following operations. The disc drive (110) includes a rotatable disc (112) having a disc surface (180, 182) with information arranged in tracks on the disc surface (180, 182). The disc drive (110) also includes a transducer (144) for accessing the information on the disc surface (180, 182). An actuator arm (126) is operably coupled to the transducer (144). An actuator (173) is operably coupled to the actuator arm (126) to move the transducer (144) relative to the disc surface (180, 182) to follow one of the tracks during track following. A model-based servo controller (190) is operably coupled to the actuator (173) to control movement of the actuator (173). The model-based servo controller (190) provides robust track following control over a desired frequency range.
GB9928819A 1997-08-07 1998-05-15 Disc drive with robust track following servo controller Withdrawn GB2341481A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US5512697P 1997-08-07 1997-08-07
US2645598A 1998-02-19 1998-02-19
PCT/US1998/009965 WO1999008267A1 (en) 1997-08-07 1998-05-15 Disc drive with robust track following servo controller

Publications (2)

Publication Number Publication Date
GB9928819D0 GB9928819D0 (en) 2000-02-02
GB2341481A true GB2341481A (en) 2000-03-15

Family

ID=26701271

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9928819A Withdrawn GB2341481A (en) 1997-08-07 1998-05-15 Disc drive with robust track following servo controller

Country Status (6)

Country Link
JP (1) JP2001512881A (en)
KR (1) KR20010022679A (en)
CN (1) CN1266525A (en)
DE (1) DE19882560T1 (en)
GB (1) GB2341481A (en)
WO (1) WO1999008267A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19983934T1 (en) 1999-02-22 2002-01-24 Seagate Technology Closed control loop scaling for time-discrete servo controllers in a disk drive
US6999909B1 (en) 1999-10-28 2006-02-14 Seagate Technology Llc Process for designing an optimal vibration isolation mount for a disc drive
GB2371917B (en) * 1999-10-28 2003-07-30 Seagate Technology Llc Process for designing an optimal vibration isolation mount for a disc drive
US6621653B1 (en) * 2000-06-09 2003-09-16 Hitachi Global Storage Technologies Netherlands B.V. Secondary actuator system for mode compensation
US6947852B2 (en) * 2002-06-04 2005-09-20 Kla-Tencor Technologies Corporation Monitoring and correcting for non-translational motion in a resonance measurement apparatus
CN109991852B (en) * 2019-04-19 2022-02-22 贵州大学 Control method of fractional order electrostatic driving micro-electromechanical system with hysteresis characteristic

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189578A (en) * 1989-06-28 1993-02-23 Hitachi, Ltd. Disk system with sub-actuators for fine head displacement
US5444583A (en) * 1992-09-30 1995-08-22 Quantum Corporation Disk drive having on-board triggered digital sampling analyzer
US5745319A (en) * 1992-08-12 1998-04-28 Kabushiki Kaisha Toshiba Recording/reproducing apparatus with coarse and fine head positioning actuators and an elastic head gimbal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5189578A (en) * 1989-06-28 1993-02-23 Hitachi, Ltd. Disk system with sub-actuators for fine head displacement
US5745319A (en) * 1992-08-12 1998-04-28 Kabushiki Kaisha Toshiba Recording/reproducing apparatus with coarse and fine head positioning actuators and an elastic head gimbal
US5444583A (en) * 1992-09-30 1995-08-22 Quantum Corporation Disk drive having on-board triggered digital sampling analyzer

Also Published As

Publication number Publication date
GB9928819D0 (en) 2000-02-02
WO1999008267A1 (en) 1999-02-18
JP2001512881A (en) 2001-08-28
CN1266525A (en) 2000-09-13
KR20010022679A (en) 2001-03-26
DE19882560T1 (en) 2000-07-20

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)