Garbage collection method for nonvolatile memory device

摘要

A nonvolatile memory device includes a memory area having free segments and first to fourth regions having used segments. The garbage collection method includes selecting a target segment from the used segments, moving a valid data block from the selected target segment to the used segments, and erasing data of all data blocks in the selected target segment and making the selected target segment into a free segment. When the number of free segments is greater than a predefined value, the target segment is selected by a first method and valid data blocks in the target segment are moved by a second method. When the number of free segments is less than the predefined value, the target segment is selected by a third method and valid data blocks in the target segment are moved by a fourth method.

主权项

1. A garbage collection method of a nonvolatile memory device comprising a memory area including a plurality of free segments and first to fourth regions having a plurality of used segments, the method comprising:
selecting a target segment from the plurality of used segments; moving a valid data block included in the selected target segment to the used segments included in one of the first to fourth regions; and erasing data of all data blocks included in the selected target segment and making the selected target segment into a free segment, wherein when the number of free segments included in the memory area is greater than a predefined value, the target segment is selected by a first method and valid data blocks included in the target segment are moved by a second method, and when the number of free segments included in the memory area is less than the predefined value, the target segment is selected by a third method different from the first method and valid data blocks included in the target segment are moved by a fourth method different from the second method.