Flexible magnetic disc drive apparatus for designating alternate

Details Flexible magnetic disc drive apparatus for designating alternate Flexible magnetic disc drive apparatus for designating alternate

1992-01-10

1994-10-18

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

G11B 509

Patent

active

053573811

ABSTRACT:
A flexible magnetic disc drive apparatus is provided in which access efficiency to a flexible magnetic disc is improved, and which enables rewriting alternate information in the case of alternate registration and allows access even if there is a defect in an ID field. The flexible magnetic disc drive apparatus defines an alternate area for a defective sector assigned with a logical sector number separately from usual sectors provided outside a user area on a medium where normal access is performed, a system area for registering the alternate information and for other purposes, an area for writing the number of rewrite times of the plurality of system areas, and a storage section for storing alternate information read out of the system area, wherein it is made possible to apply a predetermined operation to the storage section where alternate information has been registered so as to be retrieved at a high speed when accessing the medium, and to recognize a correct alternate information among a plurality of informations even where a defect is generated in the system area on the medium.

REFERENCES:
patent: 4833665 (1989-05-01), Tokumitsu et al.
patent: 4924331 (1990-05-01), Robinson et al.
patent: 4984230 (1991-01-01), Satoh et al.
patent: 5075804 (1991-12-01), Deyring

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