Storage device having nonvolatile memory device and write method

  • US 9,715,444 B2
  • Filed: 03/06/2013
  • Issued: 07/25/2017
  • Est. Priority Date: 06/01/2012
  • Status: Active Grant
First Claim
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1. A method of storing write data in a storage device including a nonvolatile memory device having a memory cell array of nonvolatile memory cells, the method comprising:

  • receiving write data in conjunction with a write request indicating a write operation;

    in response to the write request, detecting a number of free blocks available in the memory cell array;

    if the detected number of free blocks is less than a threshold value, allocating a log block only in accordance with a sub-block unit, and if the detected number of free blocks is not less than the threshold value, allocating the log block in accordance with one of the sub-block unit and a physical block unit, wherein the sub-block unit is smaller than the physical block unit; and

    executing the write operation for the write data according to the log block,wherein the memory cell array is a three-dimensional memory cell array, andwherein the sub-block unit corresponds to an erase unit of the memory cell array.

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