Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data verification
Patent
1997-05-09
2000-03-07
Psihs, Aristotelis M.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data verification
360 31, 360 47, 369 47, 369 58, G11B 509
Patent
active
060348313
ABSTRACT:
A data recording disk drive is provided with a reassignment architecture that employs both an "in-line" approach for small disk defects and an "off-site" reassignment for multiple-sector defects. As a further aspect of the invention, the defective sites that have been off-site reassigned are periodically reinspected to determine whether they in fact remain defective. If it is determined upon inspection that the defect is no longer present, the data in the off-site reassign area is returned to its original location, freeing spares for reuse. As a further aspect of the invention, reinspection is performed at disk drive spin-up or during idle periods.
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Dobbek Jeffrey J.
Yu Mantle Man-Hon
Bluestone Randall J.
Davidson Dan I.
Foerster Ingrid M.
International Business Machines - Corporation
Psihs Aristotelis M.
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