Patent ID: 7478270

Claim:
An information processing device for controlling a data writing operation to a memory for writing data after erasure thereof, wherein said memory comprises a management table comprising three first to third pages for managing arrangement information of a data area, and said information processing device comprises; page updating means which erases and writes with valid arrangement information one of said first and second pages in accordance with a data update of the data area; valid page determining means which determines whether or not said first and second pages are valid; page copying means which erases said third page and writes, to said third page, in a data page that is determined as valid by said valid page determining means; and page erasing means which erases the page that is determined as invalid by said valid page determining means wherein said information processing device further comprises: stage determining means which determines a data writing stage at the occurrence time of power shut-off operation based on the validity and stability of said first to third pages, at the next start time when the power is shut off in progress of the data writing operation.