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Memory system and control method thereof

  • US 8,886,868 B2
  • Filed: 05/12/2010
  • Issued: 11/11/2014
  • Est. Priority Date: 12/28/2007
  • Status: Active Grant
First Claim
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1. A control method of a memory system including a nonvolatile memory having a plurality of blocks as data erase units, the method comprising:

  • storing an erase time which indicates when data of each block is erased;

    generating a block table indicating a correspondence relation between a status value indicating one of a free state and an in-use state and the erase time for each block;

    selecting a first block which is set in a free state and whose erase time is oldest based on information of the block table; and

    writing data supplied from at least an exterior into the first block.

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