Patent ID: 11914896
Assignee: KIOXIA CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 8:
9. The method of claim 8, wherein:
the nonvolatile memory has a structure in which data is unable to be overwritten to an area where data is already written, and includes a plurality of blocks; and
the method further comprises:
selecting a block in the second area and in which data is stored using the first mode as a first movement source block of first valid data, selecting a first free block in the second area as a first movement destination block of the first valid data, and executing garbage collection for reusing areas where unnecessary data remains in the nonvolatile memory by writing the first valid data to the first destination block; and
selecting one or both of a block in the first area and in which data is stored using the first mode and a block in the second area in and in which data is stored using the second mode as a second movement source block of second valid data, selecting a second free block in the second area as a second movement destination block of the second valid data, and executing garbage collection by writing the second valid data to the second destination block.