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Disk File Defect Strategy Disclosure Number: IPCOM000061895D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09

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Cunningham, EA [+details]


A typical method of compensation for defective sectors in a disk file is to provide extra sectors in each track as alternates for any sectors having defects making them unusable. This is effective when the number of defects is equal to or less than the number of extra sectors allotted. Where there are more defective sectors than the number of spares allotted on the track, a bad or defective track is defined. Extra tracks are allowed within a band of tracks, and, should the number of bad tracks exceed the number of allotted spares, the disk fails.