G - Physics – 11 – B
Patent
G - Physics
11
B
352/19.6
G11B 20/18 (2006.01) G11B 5/012 (2006.01) G11B 5/455 (2006.01) G11B 27/36 (2006.01)
Patent
CA 1274623
DISK DRIVE OPTIMIZED CHANNEL CIRCUIT Abstract of the Disclosure 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.
535599
Christensen Thomas Charles
Coker Jonathan Darrel
Cunningham Earl Albert
Jaworski Richard Casimir
Kerwin Gregory John
International Business Machines Corporation
Saunders Raymond H.
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