One or more logical tracks per physical track in a headerless disk drive
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United States of America Patent
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Nov 10, 1998
Grant Date -
N/A
app pub date -
Apr 9, 1996
filing date -
Apr 9, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for mapping a physical track having more than a predetermined number of defective or spare sectors into two or more logical tracks to increase the number of defects the drive can handle in a constrained memory environment. The invention is particularly applicable to NoID.TM. disk drives. An interface processor is operatively coupled to a storage medium having concentric tracks for recording data therein. The interface processor maps physical tracks to logical tracks and determines whether defective and/or spare sectors exist in the physical track. The interface processor also redefines a physical track having more than a predetermined number of defective or spare sectors as at least one logical track. The at least one logical track has fewer than the predetermined number of defective or spare sectors within its boundaries. That is, a location for the defective and/or spare sectors is not mapped into the track detail. The dynamic track boundaries will change for each read or write.
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