High-speed rewritable storage device using nonvolatile memory and data rewriting method of the storage device

摘要

PROBLEM TO BE SOLVED: To reduce a rewrite time by executing a deleting operation of other memory blocks to be rewritten in next in parallel with writing operation into a certain memory block when plural consecutive data blocks are rewritten. SOLUTION: When it is confirmed that a writing data block D2 into a memory block 320 ended normally, a transfer processing 41 for transferring the data block D3 a buffer memory is executed (processing 10), and a transfer processing 43 for transferring the data D3 to a block 311 of a first rewritable nonvolatile memory (processing 11) and a write processing 44 (processing 12) for successively writing this data D3 into the memory block 311 are successively executed. A similar processing (processing 13-) are executed on the processing for rewriting a fourth data block D4 into a memory block 321. Hereafter, contents of memory blocks are sequentially rewritten. And, it is possible to execute an erase processing 42 in parallel with the write processing 44.