Nonvolatile storage with high speed data access

摘要: A non-volatile storage that is composed of a plurality flash memory chips further comprises: cache having entries each storing data block corresponding to in the memory, write bit for indicating said and an erase has been erased, selections means selecting chip other than be accessed by host whose set not set, erasing selected block. The present invention realized high speed access reducing wait time spent start rewriting operation after completion operation. improved efficiency operations are concentrated time.