CA2102087A1 - Contact Recording Disk File with a Magnetoresistive Read Sensor - Google Patents

Contact Recording Disk File with a Magnetoresistive Read Sensor

Info

Publication number
CA2102087A1
CA2102087A1 CA2102087A CA2102087A CA2102087A1 CA 2102087 A1 CA2102087 A1 CA 2102087A1 CA 2102087 A CA2102087 A CA 2102087A CA 2102087 A CA2102087 A CA 2102087A CA 2102087 A1 CA2102087 A1 CA 2102087A1
Authority
CA
Canada
Prior art keywords
disk
sensor
modulation
disk file
contact
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
CA2102087A
Other languages
French (fr)
Other versions
CA2102087C (en
Inventor
Moris Musa Dovek
John Stuart Foster
Donald K. F. Lam
Erich Sawatzky
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.)
HGST Netherlands BV
Original Assignee
Moris Musa Dovek
John Stuart Foster
Donald K. F. Lam
Erich Sawatzky
International Business Machines Corporation
Hitachi Global Storage Technologies Netherlands B.V.
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 Moris Musa Dovek, John Stuart Foster, Donald K. F. Lam, Erich Sawatzky, International Business Machines Corporation, Hitachi Global Storage Technologies Netherlands B.V. filed Critical Moris Musa Dovek
Publication of CA2102087A1 publication Critical patent/CA2102087A1/en
Application granted granted Critical
Publication of CA2102087C publication Critical patent/CA2102087C/en
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
    • G11B5/60—Fluid-dynamic spacing of heads from 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
    • G11B5/48—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
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10203—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter baseline correction
    • 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
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/027—Analogue recording
    • G11B5/035—Equalising
    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording
    • 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
    • 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
    • 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
    • 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
    • G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
    • G11B2005/0013—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation
    • G11B2005/0016—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure of transducers, e.g. linearisation, equalisation of magnetoresistive transducers

Abstract

A contact magnetic recording rigid disk file utilizes a magnetoresistive (MR) sensor for reading data recorded on the disk. The disk file may be of the liquid-bearing type of contact recording with the MR sensor supported on the trailing end of a carrier which rides on the liquid bearing.
The performance of the disk file is enhanced by including means for minimizing the effect of a discovered baseline read signal modulation. The modulation has been determined to be caused by variable cooling of the temperature-sensitive and temperature-elevated MR sensor by the disk, with the temperature variation being directly related to the variation in head-disk spacing caused by the waviness of the surface of the disk. A filter may be incorporated into the read signal processing circuitry of the disk file to eliminate the modulation, the MR sensor may be designed to operate at selected parameters to minimize the effect of the baseline modulation, and the portion of the carrier in contact with the disk surface may be selected to have a length less than the period of the disk waviness so that it more closely follows the disk surface topography.
CA002102087A 1993-02-18 1993-10-29 Contact recording disk file with a magnetoresistive read sensor Expired - Fee Related CA2102087C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US19,968 1993-02-18
US08/019,968 US5455730A (en) 1993-02-18 1993-02-18 Contact magnetic recording disk file with a magnetoresistive read sensor

Publications (2)

Publication Number Publication Date
CA2102087A1 true CA2102087A1 (en) 1994-08-19
CA2102087C CA2102087C (en) 1998-11-24

Family

ID=21796052

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002102087A Expired - Fee Related CA2102087C (en) 1993-02-18 1993-10-29 Contact recording disk file with a magnetoresistive read sensor

Country Status (20)

Country Link
US (1) US5455730A (en)
EP (1) EP0685103B1 (en)
JP (1) JP2788600B2 (en)
KR (1) KR0140714B1 (en)
CN (1) CN1084507C (en)
AT (1) ATE201524T1 (en)
BG (1) BG61541B1 (en)
BR (1) BR9400133A (en)
CA (1) CA2102087C (en)
CZ (1) CZ290656B6 (en)
DE (1) DE69330256T2 (en)
ES (1) ES2157973T3 (en)
HU (1) HU216673B (en)
MY (1) MY110942A (en)
PH (1) PH31345A (en)
PL (1) PL172763B1 (en)
RU (1) RU2113019C1 (en)
SG (1) SG45210A1 (en)
TW (1) TW396335B (en)
WO (1) WO1994019793A1 (en)

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Also Published As

Publication number Publication date
CZ290656B6 (en) 2002-09-11
KR0140714B1 (en) 1998-07-15
JPH06259739A (en) 1994-09-16
MY110942A (en) 1999-07-31
TW396335B (en) 2000-07-01
US5455730A (en) 1995-10-03
HUT72801A (en) 1996-05-28
DE69330256D1 (en) 2001-06-28
JP2788600B2 (en) 1998-08-20
CZ9502115A3 (en) 2002-05-15
ATE201524T1 (en) 2001-06-15
BG99875A (en) 1996-05-31
PL310176A1 (en) 1995-11-27
ES2157973T3 (en) 2001-09-01
WO1994019793A1 (en) 1994-09-01
DE69330256T2 (en) 2001-10-11
EP0685103A1 (en) 1995-12-06
CA2102087C (en) 1998-11-24
BG61541B1 (en) 1997-11-28
HU9502416D0 (en) 1995-10-30
KR940020313A (en) 1994-09-15
CN1096607A (en) 1994-12-21
PL172763B1 (en) 1997-11-28
EP0685103B1 (en) 2001-05-23
BR9400133A (en) 1994-10-04
HU216673B (en) 1999-08-30
CN1084507C (en) 2002-05-08
PH31345A (en) 1998-07-17
SG45210A1 (en) 1998-01-16
RU2113019C1 (en) 1998-06-10

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