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Nonvolatile memory system and block management method

  • US 8,996,786 B2
  • Filed: 12/28/2011
  • Issued: 03/31/2015
  • Est. Priority Date: 01/28/2011
  • Status: Active Grant
First Claim
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1. A nonvolatile memory system comprising:

  • a memory area including a plurality of blocks; and

    a controller configured to control the memory area,wherein the controller groups the plurality of blocks of the memory area according to whether a wear level of each block is less than a predetermined wear level limit threshold value and whether each of the plurality of blocks is in use, and manages blocks of each group in wear level order,and the controller includes a plurality of tables including a first table of blocks having a wear level less than the predetermined wear level limit threshold value and are not in use, a second table including blocks having a wear level greater than or equal to the predetermined wear level limit threshold value and are not in use, a third table including blocks having a wear level less than the predetermined wear level limit threshold value and are in use, and a fourth table including blocks having a wear level greater than or equal to the predetermined wear level limit threshold value and are in use.

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