Data rewriting for flash memory
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United States of America Patent
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Aug 15, 2006
Grant Date -
Jun 17, 2004
app pub date -
Sep 22, 2003
filing date -
Dec 17, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A data storage apparatus includes a flash memory and a control unit that controls the rewriting of data in the flash memory. The flash memory is divided into sectors, each of which is completely erasable in a time T. During a rewriting operation, multiple sectors are erased simultaneously for a time U less than T, and new data are written in a sector that has undergone multiple erasures and is now fully erased. The new data typically replace data stored in a sector that proceeds to be erased during multiple rewriting operations. The duration of each rewriting operation is reduced because the erasing process lasts for time U instead of time T.
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