Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1991-09-11
1993-08-10
Psitos, Aristotelis
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 58, 369 48, 369124, G11B 700
Patent
active
052355853
ABSTRACT:
The present invention locates spare sectors for replacing secondary defects found during disk use. A sorted defective sector list is maintained for tracking the spare sectors that have been previously used for replacements of other secondary defects. When a secondary defect address is found, a secondary defect list is updated both on the disk and in the drive's memory. A spare sector, for replacing the secondary defect is located by first calculating a group number to determine which group the secondary defect is located in. Next, the boundaries for a plurality of spare sectors allocated for that group is determined. After searching the replacement sector list, the first available spare sector of the plurality of spare sectors is identified as the replacement sector. If all of the plurality of spare sectors have been previously assigned as replacement sectors, a spare sector is instead located from a plurality of spare sectors allocated to a neighboring group. After locating the spare sector, its physical address is returned and the spare sector is logged in the defective sector list and in the replacement list.
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ISO(IEC 10089:1991 CE, 130 mm Recruitable Optical Cartridge for Information Interchange.
Bish John E.
Fok Daniel W.
Goodman Brian G.
Mojica Arturo A.
Anderson F. E.
Edun Muhammad
International Business Machines
Psitos Aristotelis
Shifrin D. A.
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