Method of writing, erasing, and controlling memory for memory device
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United States of America Patent
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-
Dec 12, 2000
Issued Date -
N/A
app pub date -
Aug 30, 1999
filing date -
Oct 1, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
Data transferred from a host computer to a memory device is written into sectors whose addresses in a memory area are decoded by a decode table. Old data to be updated by the above data is erased or marked with erase flags. At a predetermined point of time, in order to create free areas, necessary data is evacuated to a primary memory media and unnecessary data indicated by erase flags is erased by a unit of predetermined memory size. Part of the memory media which has become defective is marked with a defect flag, and is replaced by an alternate area. In doing so, the decode table is rewritten to rearrange the memory area.
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