Method for checking disk identity in a flexible disk recorder

Details Method for checking disk identity in a flexible disk recorder Method for checking disk identity in a flexible disk recorder

1982-12-23

1986-03-25

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

360135, 360137, G11B 502, G11B 509

Patent

active

045787220

ABSTRACT:
A diskette identifying code is written in each sector on a flexible disk used in a flexible disk recorder. The diskette identifying code can be read from any track on the flexible disk and used to log the occurrence of insertion or removal of the diskette at the flexible disk recorder. Also, the diskette identifying code can be read from any accessed track prior to a write operation on that track in order to verify that the diskette has not been changed by the operator since the last access to the flexible disk.

REFERENCES:
patent: 3335410 (1967-08-01), Baskin et al.
patent: 3340539 (1967-09-01), Sims, Jr.
patent: 4241420 (1980-12-01), Fish et al.
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4393445 (1983-07-01), Milligan et al.
IBM-TDB vol. 21, No. 2, Jul. 1978-Gupuge, Preventing Unauthorized Access to Diskette-Loaded Microcode.

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