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Source and Shadow Wear-Leveling Method and Apparatus

  • US 20070276987A1
  • Filed: 06/22/2007
  • Published: 11/29/2007
  • Est. Priority Date: 02/26/2004
  • Status: Active Grant
First Claim
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1. An flash memory system comprising:

  • flash memory organized into a plurality of blocks of pages, for storage of information, a page including data and spare, the blocks being identifiable, within the flash memory, by a physical address; and

    a flash controller adapted to communicate with a host and the flash memory and including volatile memory configured to store a source-shadow table of logical addresses addressable by the physical addresses, the logical addresses identifying the blocks, by the controller, the table having an address mapping table and a property value table, the property value table including property values, each of which is associated with a block of a predetermined group of blocks and indicative of the number of times a block has been written, the property values corresponding to the logical addresses of the address mapping table, wherein a block having been written no more than two times is re-written to different areas of the flash memory without requiring an erase operation.

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