Compensation of write current adn delta-V for recording componen

Details Compensation of write current adn delta-V for recording componen Compensation of write current adn delta-V for recording componen

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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patent: 4633336 (1986-12-01), Horie et al.
patent: 4635142 (1987-01-01), Haugland

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