Method and system for managing bad areas in flash memory
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United States of America Patent
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Jul 10, 2001
Grant Date -
N/A
app pub date -
Dec 4, 1998
filing date -
Dec 4, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A method, system and computer-readable medium for managing bad areas in flash memory. The flash memory is initialized by formatting the flash memory into a spare area and a data area with the spare area and the data area including a plurality of spare blocks and data blocks, respectively. In addition, spare blocks are grouped together forming a chunk. A working chunk map is created for storing format information and re-mapping information. The working chunk map includes a BBM header and a plurality of BBM entries that correspond to the spare blocks in each chunk. The working chunk map is written to one of the plurality of spare blocks in a chunk, designated as a copy chunk map. The working chunk map is also written to another one of the plurality of spare blocks in a chunk, designated as an original chunk map.
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