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Data storage device shifting data chunks of alignment zone relative to sector boundaries

  • US 9,063,838 B1
  • Filed: 01/23/2012
  • Issued: 06/23/2015
  • Est. Priority Date: 01/23/2012
  • Status: Active Grant
First Claim
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1. A data storage device comprising a non-volatile memory comprising a plurality of sectors, and control circuitry operable to define at least one alignment zone comprising a plurality of chunks including a plurality of data chunks and a plurality of pad chunks, wherein:

  • each chunk comprises a plurality of sectors;

    each sector is operable to store X host blocks, where X is an integer greater than one;

    the alignment zone comprises at least X−

    1 pad chunks; and

    the control circuitry is operable to;

    shift the data chunks of the alignment zone by a non-zero integer number of chunks equal to or less than X−

    1 plus a corresponding offset;

    first shift the data chunks right by N1 chunks plus a first offset while maintaining at least one copy of the data chunks;

    after first shifting the data chunks right by N1 chunks, second shift the data chunks left by N2 chunks plus a second offset while maintaining at least one copy of the data chunks; and

    after second shifting the data chunks left by N2 chunks, third shift the data chunks left by N3 chunks plus a third offset while maintaining at least one copy of the data chunks,wherein the first, second, and third offsets represent different fractions of a sector.

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