Circuit arrangement for the selective suppression and nonsuppres

Details Circuit arrangement for the selective suppression and nonsuppres Circuit arrangement for the selective suppression and nonsuppres

1987-11-10

1989-04-25

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

360 7813, G11B 502, G11B 2108

Patent

active

048253090

ABSTRACT:
A control system for a disk drive operating under the control of a host system for data transfer with a magnetic disk medium. The host system provides a signal indicative of whether the disk drive is in operation in a read-only mode or in a write-only or read-and-write mode. During operation in the write-only and read-and-write modes, the control system inhibits the delivery to the host system of both read data and index pulses during, for example, a disk start-up time, and access time and a transducer loading time, because the data recovered from the disk medium during such times may be inaccurate, inviting inaccurate writing. However, during operation in the read-only mode, the control system constantly permits the delivery of read data and index pulses to the host system with a view to the curtailment of the average read access time.

REFERENCES:
patent: 4688112 (1987-08-01), Shoji et al.
patent: 4777545 (1988-10-01), Shoji et al.

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