Detection of overusage of spare sectors in an optical disk

Details Detection of overusage of spare sectors in an optical disk Detection of overusage of spare sectors in an optical disk

1993-10-28

1995-05-23

Epps, Georgia Y.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369 55, 369 47, 369 48, G11B 700

Patent

active

054187672

ABSTRACT:
An apparatus and method are provided for tracking the number of permanent and temporary errors, and spare sectors used as a result of the errors, on a per disk and per drive basis. During read/write operations, a determination is made as to whether the number of spares used to replace defective sectors on a disk, together with the number of spares used to replace defective sectors during formatting, exceeds a predetermined limit. This limit can be different depending upon the type of disk in use, rewritable or WORM. If the limit is exceeded, diagnostics are executed to ascertain the cause of the excess usage and appropriate corrective action, such as requesting that the disk and drive lens be cleaned, is initiated. Moreovers, an attempt can be made to recover used spare sectors on a rewritable disk.

REFERENCES:
patent: 5088081 (1992-02-01), Farr
patent: 5105427 (1992-04-01), Ando
patent: 5111444 (1992-05-01), Fukushima
patent: 5303219 (1994-04-01), Kulakowski et al.

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