Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1986-06-11
1989-04-11
Faber, Alan
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 25, 360 46, 369 53, G11B 2736, G11B 509
Patent
active
048211257
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 an 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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Christensen Thomas C.
Coker Jonathan D.
Cunningham Earl A.
Jaworski Richard C.
Kerwin Gregory J.
Faber Alan
International Business Machines - Corporation
Lahtinen Robert W.
Sachar Surinder
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