Flash translation layer cleanup system and method
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United States of America Patent
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Feb 2, 1999
Grant Date -
N/A
app pub date -
Oct 27, 1995
filing date -
Oct 27, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
A system and method of cleaning up a full erase unit in a flash translation layer, including moving all valid blocks on the full erase unit to a corresponding address location on a predetermined transfer unit, and then erasing the contents of the full erase unit. After erasure, the formerly full erase unit is redesignated to become the next transfer unit to which the contents of the next full unit will be transferred. The method also includes determining whether a criterion has been met for cleanup to be undertaken. The criteria for undertaking cleanup includes determining whether the number of free blocks is greater than a threshold which is a function of twice the number of bad blocks in the transfer erase unit plus twice the number of flash translation layer structure blocks in the full erase unit.
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