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公开(公告)号：IN189869B
公开(公告)日：2003-05-03
申请号：IN1344DE1994
申请日：1994-10-25
Applicant: IBM
Inventor： CHRISTNER JODIE ANN , CUNNINGHAM EARL ALBERT , KERWIN GREGORY JOHN , POSS JOE MARTIN
IPC: G11B5/09
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公开(公告)号：DE3750315T2
公开(公告)日：1995-03-09
申请号：DE3750315
申请日：1987-05-19
Applicant: IBM
Inventor： CHRISTENSEN THOMAS CHARLES , JAWORSKI RICHARD CASIMIR , COKER JONATHAN DARREL , KERWIN GREGORY JOHN , CUNNINGHAM EARL ALBERT , PALMER DEAN CURTIS , ROEPKE JEFFREY RALPH
Abstract: A magnetic disk drive channel circuitry is shown and described that generates eight incremental values of write current and eight incremental values of delta-V (the minimum voltage change per unit time which tests signals to discriminate between data and noise). Each of these variable parameter values may be program selected by a three bit bus signal. This variability testing of and adaptation to the optimum parameter value for each head media combination and by grouping tracks in contiguous data bands, the parameters may be optimized for tracks near the inner diameter, the outer diameter and in the middle band. The variable delta-V can also be used as an additional data recovery tool wherein re-reading with a lower value enhances recovery of missing bit errors and re-reading with an increased value can assist recovery from an extra bit error.
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公开(公告)号：DE3780220D1
公开(公告)日：1992-08-13
申请号：DE3780220
申请日：1987-04-28
Applicant: IBM
Inventor： KERWIN GREGORY JOHN , LEPAGE JOHN DONALD , WEISPFENNING JAMES MICHAEL
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公开(公告)号：BR9405114A
公开(公告)日：1995-08-08
申请号：BR9405114
申请日：1994-12-15
Applicant: IBM
Inventor： CHRISTNER JODIE ANN , CUNNINGHAM EARL A , KERWIN GREGORY JOHN , POSS JOE MARTIN
Abstract: In a magnetic data storage device having data recorded in tracks on a media surface and including at least one magnetoresistive (MR) transducer read heads, the adaptive control method for the read head bias current involves determining an optimised bias current value for each MR head. The optimised values are stored, and the active MR head is supplied with a bias current in accordance with the stored value. The optimised bias current value is periodically re-determined for each MR head, and the stored bias current values are revised to correspond with the new optimised bias current values. The bias current values are stored on a disk media surface and are transferred from disk storage to random access memory during the power up sequence of the device.
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公开(公告)号：DE3750315D1
公开(公告)日：1994-09-08
申请号：DE3750315
申请日：1987-05-19
Applicant: IBM
Inventor： CHRISTENSEN THOMAS CHARLES , JAWORSKI RICHARD CASIMIR , COKER JONATHAN DARREL , KERWIN GREGORY JOHN , CUNNINGHAM EARL ALBERT , PALMER DEAN CURTIS , ROEPKE JEFFREY RALPH
Abstract: A magnetic disk drive channel circuitry is shown and described that generates eight incremental values of write current and eight incremental values of delta-V (the minimum voltage change per unit time which tests signals to discriminate between data and noise). Each of these variable parameter values may be program selected by a three bit bus signal. This variability testing of and adaptation to the optimum parameter value for each head media combination and by grouping tracks in contiguous data bands, the parameters may be optimized for tracks near the inner diameter, the outer diameter and in the middle band. The variable delta-V can also be used as an additional data recovery tool wherein re-reading with a lower value enhances recovery of missing bit errors and re-reading with an increased value can assist recovery from an extra bit error.
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Patent Agency Ranking
公开(公告)号：DE69428864T2
公开(公告)日：2002-05-02
申请号：DE69428864
申请日：1994-11-15
Applicant: IBM
Inventor： CHRISTNER JODIE ANN , CUNNINGHAM EARL A , KERWIN GREGORY JOHN , POSS JOE MARTIN
Abstract: In a magnetic data storage device having data recorded in tracks on a media surface and including at least one magnetoresistive (MR) transducer read heads, the adaptive control method for the read head bias current involves determining an optimised bias current value for each MR head. The optimised values are stored, and the active MR head is supplied with a bias current in accordance with the stored value. The optimised bias current value is periodically re-determined for each MR head, and the stored bias current values are revised to correspond with the new optimised bias current values. The bias current values are stored on a disk media surface and are transferred from disk storage to random access memory during the power up sequence of the device.
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公开(公告)号：DE69428864D1
公开(公告)日：2001-12-06
申请号：DE69428864
申请日：1994-11-15
Applicant: IBM
Inventor： CHRISTNER JODIE ANN , CUNNINGHAM EARL A , KERWIN GREGORY JOHN , POSS JOE MARTIN
Abstract: In a magnetic data storage device having data recorded in tracks on a media surface and including at least one magnetoresistive (MR) transducer read heads, the adaptive control method for the read head bias current involves determining an optimised bias current value for each MR head. The optimised values are stored, and the active MR head is supplied with a bias current in accordance with the stored value. The optimised bias current value is periodically re-determined for each MR head, and the stored bias current values are revised to correspond with the new optimised bias current values. The bias current values are stored on a disk media surface and are transferred from disk storage to random access memory during the power up sequence of the device.
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公开(公告)号：DE69020685T2
公开(公告)日：1996-03-07
申请号：DE69020685
申请日：1990-10-22
Applicant: IBM
Inventor： KERWIN GREGORY JOHN , RAE JAMES WILSON
Abstract: In a data storage device (eg: disk drive ) providing amplitude sampling data detection, the amplitude of an analog read back signal is sampled at data clock intervals. The resulting analog values are converted to digital equivalent values. The digital equivalent values are each compared to an expected digital values that is representative of the data that was originally recorded on the disk, to thereby generate a difference value. The resulting collection of difference values are magnitude segregated, and then stored in a plurality of registers, for later use in providing a histogram that is a measure of the disk drive's read error rate.
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公开(公告)号：SG42837A1
公开(公告)日：1997-10-17
申请号：SG1996000011
申请日：1994-11-15
Applicant: IBM
Inventor： CHRISTNER JODIE ANN , CUNNINGHAM EARL A , KERWIN GREGORY JOHN , POSS JOE MARTIN
Abstract: In a magnetic data storage device having data recorded in tracks on a media surface and including at least one magnetoresistive (MR) transducer read heads, the adaptive control method for the read head bias current involves determining an optimised bias current value for each MR head. The optimised values are stored, and the active MR head is supplied with a bias current in accordance with the stored value. The optimised bias current value is periodically re-determined for each MR head, and the stored bias current values are revised to correspond with the new optimised bias current values. The bias current values are stored on a disk media surface and are transferred from disk storage to random access memory during the power up sequence of the device.
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公开(公告)号：DE69020685D1
公开(公告)日：1995-08-10
申请号：DE69020685
申请日：1990-10-22
Applicant: IBM
Inventor： KERWIN GREGORY JOHN , RAE JAMES WILSON
Abstract: In a data storage device (eg: disk drive ) providing amplitude sampling data detection, the amplitude of an analog read back signal is sampled at data clock intervals. The resulting analog values are converted to digital equivalent values. The digital equivalent values are each compared to an expected digital values that is representative of the data that was originally recorded on the disk, to thereby generate a difference value. The resulting collection of difference values are magnitude segregated, and then stored in a plurality of registers, for later use in providing a histogram that is a measure of the disk drive's read error rate.
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