Block management method for flash memory, and storage system and controller using the same
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United States of America Patent
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Sep 25, 2012
Grant Date -
Jul 15, 2010
app pub date -
Mar 18, 2009
filing date -
Jan 15, 2009
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Abstract
A block management method for a flash memory of a storage system is provided, wherein the flash memory includes a plurality of physical blocks. The block management method includes grouping the physical blocks into a plurality of physical units, and grouping the physical units into a data area, a spare area, and a replacement area. The block management method further includes performing a first physical unit switch which switches the physical units between the data area and the spare area, and performing a second physical unit switch which switches the physical units between the spare area and the replacement area. Therefore, the block management method can uniformly use the physical blocks and thereby effectively prolong a lifespan of the storage system.
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