JP4236797B2 - ディスクからヘッドをランプアンロードするための速度制御方法およびシステム - Google Patents

ディスクからヘッドをランプアンロードするための速度制御方法およびシステム Download PDF

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Publication number
JP4236797B2
JP4236797B2 JP2000206754A JP2000206754A JP4236797B2 JP 4236797 B2 JP4236797 B2 JP 4236797B2 JP 2000206754 A JP2000206754 A JP 2000206754A JP 2000206754 A JP2000206754 A JP 2000206754A JP 4236797 B2 JP4236797 B2 JP 4236797B2
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Japan
Prior art keywords
vcm
speed
current
head
velocity
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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
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JP2000206754A
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English (en)
Japanese (ja)
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JP2001052457A (ja
JP2001052457A5 (https=
Inventor
ブライアン・タナー
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Quantum Corp
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Quantum Corp
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Publication of JP2001052457A publication Critical patent/JP2001052457A/ja
Publication of JP2001052457A5 publication Critical patent/JP2001052457A5/ja
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Publication of JP4236797B2 publication Critical patent/JP4236797B2/ja
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Expired - Fee Related legal-status Critical Current

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    • 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
    • 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
    • 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
    • G11B21/12—Raising and lowering; Back-spacing or forward-spacing along track; Returning to starting position otherwise than during transducing operation
JP2000206754A 1999-07-12 2000-07-07 ディスクからヘッドをランプアンロードするための速度制御方法およびシステム Expired - Fee Related JP4236797B2 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/352,189 US6512650B1 (en) 1999-07-12 1999-07-12 Velocity control method for ramp unloading heads off of disks in a disk drive
US09/352189 1999-07-12

Publications (3)

Publication Number Publication Date
JP2001052457A JP2001052457A (ja) 2001-02-23
JP2001052457A5 JP2001052457A5 (https=) 2007-08-09
JP4236797B2 true JP4236797B2 (ja) 2009-03-11

Family

ID=23384162

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000206754A Expired - Fee Related JP4236797B2 (ja) 1999-07-12 2000-07-07 ディスクからヘッドをランプアンロードするための速度制御方法およびシステム

Country Status (2)

Country Link
US (1) US6512650B1 (https=)
JP (1) JP4236797B2 (https=)

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6614612B1 (en) * 2000-07-25 2003-09-02 Stmicroelectronics, Inc. Embedded programmable filter for disk drive velocity control
JP2002170349A (ja) * 2000-11-29 2002-06-14 Fujitsu Ltd ディスク装置
US6859340B2 (en) * 2001-03-09 2005-02-22 Seagate Technology Llc Method and device for retracting an actuator
JP4651225B2 (ja) * 2001-05-23 2011-03-16 ルネサスエレクトロニクス株式会社 磁気ディスク記憶装置および磁気ディスク記憶装置の制御方法
US7054091B2 (en) * 2002-11-23 2006-05-30 Texas Instruments Incorporated Digital processor controlled method and circuit for retracting a head carriage assembly to a parked position in a mass data storage device, or the like
US7009354B2 (en) * 2002-12-27 2006-03-07 Matsushita Electric Industrial Co., Ltd. Method for spindle bearing friction estimation for reliable disk drive startup operation
US7009806B2 (en) * 2003-02-19 2006-03-07 Matsushita Electric Industrial Co., Ltd. Accurate tracking of coil resistance
US7082009B2 (en) * 2003-02-19 2006-07-25 Matsushita Electric Industrial Co., Ltd. Accurate tracking of coil resistance based on current, voltage and angular velocity
US20050007688A1 (en) * 2003-07-09 2005-01-13 Joseph Chang Dual speed control to reduce audible noise and protect head during unload in ramp load drives with pawl latch
US6917486B2 (en) * 2003-07-18 2005-07-12 Matsushita Electrical Industrial Co., Ltd. Direct detection of coil resistance
US7035032B2 (en) * 2003-07-21 2006-04-25 Matsushita Electric Industrial Co., Ltd. Method and system for reducing power consumption in a rotatable media data storage device
US7068455B2 (en) * 2003-07-21 2006-06-27 Matsushita Electric Industrial Co., Ltd. Method and system for reducing power consumption in a rotatable media data storage device
US7145742B2 (en) * 2004-09-30 2006-12-05 Agere Systems, Inc. Velocity controlled disk drive head retraction after power loss
US7042672B2 (en) * 2004-09-30 2006-05-09 Agere Systems Inc. Velocity controlled disk drive head retraction with reduced audible noise
US7106022B2 (en) * 2004-09-30 2006-09-12 Agere Systems Inc. Velocity controlled disk drive head retraction with offset removal
US7332883B1 (en) * 2005-06-17 2008-02-19 Marvell International Ltd. Method and apparatus for initializing operation of a disk drive
US7636220B1 (en) * 2006-03-14 2009-12-22 Marvell International Ltd. Method of ramp stop detection for VCM velocity-controlled retract
US7548392B1 (en) 2007-05-21 2009-06-16 Western Digital Technologies, Inc. Disk drive controlling a voice coil motor during an emergency unload
US7573670B1 (en) * 2007-09-27 2009-08-11 Western Digital Technologies, Inc. Disk drive seeking to OD track and then ramping velocity to implement fast unload
US7876522B1 (en) 2008-09-30 2011-01-25 Western Digital Technologies, Inc. Disk drive updating estimate of voice coil resistance to account for resistance change prior to unload operation
US8179640B2 (en) * 2008-12-16 2012-05-15 Seagate Technology International Head actuator velocity control for electrical power off in a disk drive
JP4768840B2 (ja) * 2009-07-24 2011-09-07 株式会社東芝 磁気ディスク装置のロード・アンロード制御方法及び装置
US8072703B1 (en) * 2010-06-23 2011-12-06 Western Digital Technologies, Inc. Disk drive detecting when head is parked on ramp
US8665551B1 (en) 2011-12-22 2014-03-04 Western Digital Technologies, Inc. Disk drive adjusting gain and offset of BEMF velocity sensor during self writing of spiral tracks
US9076473B1 (en) 2014-08-12 2015-07-07 Western Digital Technologies, Inc. Data storage device detecting fly height instability of head during load operation based on microactuator response
US9940958B1 (en) * 2017-11-07 2018-04-10 Western Digital Technologies, Inc. Data storage device employing delayed braking to unload multiple voice coil motors
US9997182B1 (en) * 2017-11-09 2018-06-12 Western Digital Technologies, Inc. Data storage device employing balanced current drive to unload multiple voice coil motors
US10152994B1 (en) * 2017-11-09 2018-12-11 Western Digital Technologies, Inc. Data storage device concurrently disconnecting multiple voice coil motors from spindle motor BEMF voltage during unload
US10014018B1 (en) * 2017-12-15 2018-07-03 Western Digital Technologies, Inc. Data storage device seeking multiple voice coil motors using a limited current supply
JP2021034088A (ja) * 2019-08-28 2021-03-01 株式会社東芝 磁気ディスク装置、および該磁気ディスク装置のデータ保護方法
JP2023045556A (ja) * 2021-09-22 2023-04-03 株式会社東芝 磁気ディスク装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5764437A (en) * 1996-01-22 1998-06-09 Seagate Technology, Inc. Pivoting ramp for dynamic load/unload files
US5969899A (en) * 1997-04-02 1999-10-19 Mobile Storage Technology, Inc. Enhanced method and system of unloading magnetic heads

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Publication number Publication date
JP2001052457A (ja) 2001-02-23
US6512650B1 (en) 2003-01-28

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