Patent ID: 9715444
Date: 2017-07-25
CPC Classifications: G06F

Claim:
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, and wherein the sub-block unit corresponds to an erase unit of the memory cell array.