SG121786A1 - Method and system for implementing in situ low flyheight warning - Google Patents

Method and system for implementing in situ low flyheight warning

Info

Publication number
SG121786A1
SG121786A1 SG200304442A SG200304442A SG121786A1 SG 121786 A1 SG121786 A1 SG 121786A1 SG 200304442 A SG200304442 A SG 200304442A SG 200304442 A SG200304442 A SG 200304442A SG 121786 A1 SG121786 A1 SG 121786A1
Authority
SG
Singapore
Prior art keywords
implementing
situ low
warning
low flyheight
flyheight warning
Prior art date
Application number
SG200304442A
Other languages
English (en)
Inventor
Gordon James Smith
Original Assignee
Hitachi Global Storage Tech
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 Hitachi Global Storage Tech filed Critical Hitachi Global Storage Tech
Publication of SG121786A1 publication Critical patent/SG121786A1/en

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
    • G11B5/60—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
    • 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
    • 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
    • G11B21/16—Supporting the heads; Supporting the sockets for plug-in heads
    • G11B21/20—Supporting the heads; Supporting the sockets for plug-in heads while the head is in operative position but stationary or permitting minor movements to follow irregularities in surface of record carrier
    • G11B21/21—Supporting the heads; Supporting the sockets for plug-in heads while the head is in operative position but stationary or permitting minor movements to follow irregularities in surface of record carrier with provision for maintaining desired spacing of head from record carrier, e.g. fluid-dynamic spacing, slider
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/36—Monitoring, i.e. supervising the progress of recording or reproducing
    • 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
    • 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
    • G11B5/40—Protective measures on heads, e.g. against excessive temperature 
SG200304442A 2002-08-15 2003-08-15 Method and system for implementing in situ low flyheight warning SG121786A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/219,893 US6906878B2 (en) 2002-08-15 2002-08-15 Method and system for implementing in situ low flyheight warning

Publications (1)

Publication Number Publication Date
SG121786A1 true SG121786A1 (en) 2006-05-26

Family

ID=31714820

Family Applications (1)

Application Number Title Priority Date Filing Date
SG200304442A SG121786A1 (en) 2002-08-15 2003-08-15 Method and system for implementing in situ low flyheight warning

Country Status (8)

Country Link
US (1) US6906878B2 (US07576130-20090818-C00114.png)
EP (1) EP1396847B1 (US07576130-20090818-C00114.png)
JP (1) JP4098681B2 (US07576130-20090818-C00114.png)
KR (1) KR100591966B1 (US07576130-20090818-C00114.png)
CN (1) CN1314003C (US07576130-20090818-C00114.png)
DE (1) DE60306052T2 (US07576130-20090818-C00114.png)
SG (1) SG121786A1 (US07576130-20090818-C00114.png)
TW (1) TW200410215A (US07576130-20090818-C00114.png)

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US7430083B2 (en) * 2002-05-23 2008-09-30 Seagate Technology Llc Virtual head fly profile measurement
US6822816B2 (en) * 2002-05-23 2004-11-23 Seagate Technology Llc Electrical detection of low flying read/write head for a disc drive
JP2004185735A (ja) * 2002-12-04 2004-07-02 Matsushita Electric Ind Co Ltd 磁気ヘッドアセンブリおよび磁気ディスク装置
US7016131B2 (en) * 2003-08-29 2006-03-21 Agency For Science, Technology And Research Method and implementation of in-situ absolute head medium spacing measurement
US7370058B2 (en) * 2003-10-28 2008-05-06 International Business Machines Corporation Algorithm for sorting bit sequences in linear complexity
US7467138B2 (en) * 2003-10-28 2008-12-16 International Business Machines Corporation Algorithm for sorting bit sequences in linear complexity
US20060146437A1 (en) * 2004-12-30 2006-07-06 Andrei Khurshudov Apparatus for detecting contact between a read-write head and the accessed disk surface in a hard disk drive
US7190547B2 (en) * 2004-12-30 2007-03-13 Samsung Electronics Co., Ltd. Methods for detecting contact between a read-write head and the accessed disk surface in a hard disk drive
JP2007179717A (ja) * 2005-12-01 2007-07-12 Fujitsu Ltd 接触検出装置、接触検出方法、ヘッドの製造方法
US7280305B2 (en) * 2006-01-13 2007-10-09 Samsung Electronics Co., Ltd. Method and apparatus for estimating and controlling the flying height of a read-write head in a hard disk drive
US7573668B2 (en) * 2006-01-16 2009-08-11 Samsung Electronics Co., Ltd. Method and apparatus for sensing leakage current to estimate and possibly adjust flying height of a read-write head in a hard disk drive
US7558015B2 (en) * 2006-03-29 2009-07-07 Maxtor Corporation Actuation efficiency based contact detection
US20080055772A1 (en) * 2006-09-01 2008-03-06 Mcmillan Chris Method and apparatus for predicting contact of a read-write head in a hard disk drive
JP2008204561A (ja) * 2007-02-21 2008-09-04 Hitachi Global Storage Technologies Netherlands Bv 情報記録装置
US20080204922A1 (en) * 2007-02-28 2008-08-28 Motomu Hashizume Methods and apparatus to monitor hard-disk drive head position
US7616398B2 (en) * 2007-11-09 2009-11-10 Hitachi Global Storage Technologies Netherlands B.V. Fly height adjustment device calibration
US7788268B2 (en) * 2008-01-08 2010-08-31 International Business Machines Corporation In-place sorting using node specific mask width
JP4986876B2 (ja) * 2008-02-02 2012-07-25 ヒタチグローバルストレージテクノロジーズネザーランドビーブイ ディスク・ドライブ装置
US8934192B1 (en) * 2008-11-24 2015-01-13 Western Digital Technologies, Inc. Disk drive determining operating fly height by detecting head disk contact from read signal amplitude variance
JP2011018396A (ja) * 2009-07-08 2011-01-27 Hitachi Global Storage Technologies Netherlands Bv ディスク・ドライブ及びクリアランス測定方法
US8169726B2 (en) * 2010-07-19 2012-05-01 Lsi Corporation Disk file preamplifier frequency-response and time delay compensation

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
US5168413A (en) * 1990-11-30 1992-12-01 Ibm Corporation Transducer head flying height monitoring methods and apparatus for disk drive system
US5220466A (en) * 1991-05-21 1993-06-15 International Business Machines Corporation Method and apparatus for digital filter control in a partial-response maximum-likelihood disk drive system
JP2711207B2 (ja) * 1992-05-19 1998-02-10 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 クリアランス及び滑りの測定が可能でヘッド衝突の警告をするディスク・ファイル記憶装置及びクリアランス測定方法
US5377058A (en) 1992-12-31 1994-12-27 International Business Machines Corporation Fly height servo control of read/write head suspension
JPH0757376A (ja) * 1993-08-18 1995-03-03 Hitachi Ltd 磁気ディスク装置及びディスクサブシステム
US5497085A (en) * 1994-12-19 1996-03-05 Conner Peripherals, Inc. Method for determining an outer diameter rolloff in a process for making magnetic disks
JP3199996B2 (ja) * 1995-11-15 2001-08-20 株式会社東芝 ディスク記録再生システム及びそのヘッド浮上変動検出方法
US5999360A (en) 1996-10-15 1999-12-07 Seagate Technology, Inc. Disc drive servo system employing thermal signals
US6046596A (en) 1996-11-13 2000-04-04 Seagate Technology, Inc. Capacitance probe for magnetic recording head transducer to disc surface spacing measurement
US5909330A (en) * 1996-12-12 1999-06-01 Maxtor Corporation Method and apparatus for detecting head flying height in a disk drive
US6735027B2 (en) 1998-06-02 2004-05-11 Texas Instruments Incorporated Head fly height by using the applied peak area ratio to determine signal PW50
US6301797B1 (en) * 1998-06-04 2001-10-16 Seagate Technology Llc Recognizing and compensating for disk shift in computer disk drives
US6411458B1 (en) * 1999-04-23 2002-06-25 Western Digital Technologies, Inc. Disk drive employing method of monitoring transducer flying height to retire defective data site on recording surface
US6570730B1 (en) 1999-06-09 2003-05-27 Seagate Technology, Llc. Shear-based transducer for HDD read/write element height control

Also Published As

Publication number Publication date
KR100591966B1 (ko) 2006-06-21
DE60306052D1 (de) 2006-07-27
JP4098681B2 (ja) 2008-06-11
JP2004111022A (ja) 2004-04-08
DE60306052T2 (de) 2007-01-11
EP1396847A3 (en) 2004-07-21
CN1314003C (zh) 2007-05-02
EP1396847B1 (en) 2006-06-14
CN1503232A (zh) 2004-06-09
US20040032681A1 (en) 2004-02-19
TW200410215A (en) 2004-06-16
EP1396847A2 (en) 2004-03-10
US6906878B2 (en) 2005-06-14
KR20040016424A (ko) 2004-02-21

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