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Data set recovery by codeword overlay

  • US 6,640,326 B1
  • Filed: 05/30/2000
  • Issued: 10/28/2003
  • Est. Priority Date: 06/28/1999
  • Status: Expired due to Term
First Claim
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1. A method of recovering data written onto a data storage mediun as a plurality of encoded data fragments said method comprising the steps of:

  • performing a first read operation to read at least one encoded data fragment of said plurality of encoded data fragments from said data storage medium;

    storing a first status data indicating whether said at least one data fragment has been correctly read;

    if said at least one data fragment is correctly read, writing said at least one read data fragment to a buffer memory;

    attempting to decode said at least one encoded data fragment in said buffer memory;

    if said attempted decoding is unsuccessful, performing a second read operation resulting in re-reading said at least one encoded data fragment from said data storage medium;

    attempting to decode said re-read encoded data fragment; and

    if said re-read data fragment has fewer bytes in error than said at least one encoded data fragment, overwriting said at least one encoded data fragment with said tread encoded data fragment.

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