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Apparatus for detecting and recovering from data destruction caused in an unaccessed memory cell by read, and method therefor

  • US 8,281,220 B2
  • Filed: 01/03/2008
  • Issued: 10/02/2012
  • Est. Priority Date: 05/16/2007
  • Status: Active Grant
First Claim
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1. A non-volatile data storage apparatus, comprising:

  • a plurality of memory chips; and

    a memory controller coupled to the plurality of memory chipswherein each of the memory chips includes a plurality of management areas,wherein the memory controller is configured to;

    write, in the plurality of memory chips, data and an error correction code calculated from the data;

    count the number of data read processing for each of the management areas;

    read, when the number of data read processing that is counted for a first management area of the plurality of management areas, exceeds a first threshold, the data and the error correction code that are stored in the first management area;

    decode the error correction code read from the first management area; and

    write the data corrected by decoding the error correction code in other management areas than the first management area,wherein the first threshold is decreased with increasing an erase count in the first management area.

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