Method of overwriting data in nonvolatile memory and a control apparatus used for the method

  • US 20020199054A1
  • Filed: 05/20/2002
  • Published: 12/26/2002
  • Est. Priority Date: 05/22/2001
  • Status: Active Grant
First Claim
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1. A method of overwriting nonvolatile memory data in which data of interest is stored sector by sector, comprising, when overwriting data of interest, the steps of:

  • providing a backup region having at least the same memory capacity as said sector to which data to be overwritten belongs;

    pre-overwriting data in said sector to which data to be overwritten belongs is first written in said backup region;

    then, erasing data to be overwritten pre-overwrite from said sector; and

    then, post-overwriting data written in said sector together with an error detection code for said post-overwrite data.

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