Flash memory management method including shifting or copying data to other blocks to optimize storage space and allow entire blocks to be erased
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United States of America Patent
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Aug 3, 1999
Grant Date -
N/A
app pub date -
Sep 29, 1995
filing date -
Sep 30, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of operating a flash memory which can be recorded in 'byte' o in 'word' form, but can only be erased in blocks, is disclosed. A memory optimization algorithm is used where the degree of filling of the individual blocks in the flash memory is determined and compared to a threshold. According to the degree of filling, data are shifted to the end of the memory, or it is determined whether an entire block can be erased, or whether copying can take place into open areas of blocks within the memory so that an entire block can be erased, or whether files can be temporarily stored in areas marked for erasure and reconstructed after the block has been erased, or if files can be overwritten to areas marked for erasure by means of a linkage. In the event that optimization is not possible, a user inquiry may be made.
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