| 摘要 |
A semiconductor storage device comprises a flash memory and manages the sectors in the unit of groups each consisting of n sectors. A logical sector number is converted to a logical group number and an offset address, and a conversion table is provided to convert a physical group number to a logical group number. A logical sector number is divided with n to get a quotient and a remainder which are set as a logical number and as an offset address. An access controller determines a physical group number corresponding to the logical group number with reference to the address conversion table, and it accesses a sector in correspondence to the offset address in the physical group number. Further, a group management information for each group is stored in a memory, and when a sector of a logical sector number is accessed, a physical group number of a group storing the data of the sector is traced by referring the conversion table and the group management information.
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