OUTER STORAGE DEVICE USING PLURAL FLASH MEMORIES

摘要

PROBLEM TO BE SOLVED: To prolong the life of an outer storage device rotating a data storage position using flash memories whose number of rewriting times is limited among the flash memories and to speed up access speed. SOLUTION: In an outer storage device, fixed data and rewriting data are separately stored, and the number of garbage collection time is stored in the management area of a flash memory. The time of rotation is judged and the number of data rewriting times is stored in the management area of a physical sector in the flash memory when fixed data and rewriting data are not discriminated so as to discriminate fixed data and rewriting data.