ACCESS DEVICE, INFORMATION RECORDING DEVICE, INFORMATION RECORDING SYSTEM, FILE MANAGEMENT METHOD, AND PROGRAM

摘要

When the memory area of a nonvolatile memory of an information recording device is managed by means of a FAT-type file system and the reliability of directory entries is enhanced using a circular shift-type checksum, recalculation of the circular shift-type checksum is performed efficiently and the speed of seeking operation is increased. The nonvolatile memory (25) of the information recording device (2) is managed by means of the FAT-type file system and a plurality of directory entries are assigned to one file. The reliability of the plurality of directory entries is enhanced using the circular shift-type checksum, and information indicating the position and size of an area for storing file data is managed using an extent information entry (203). Moreover, an updated information entry (204) and a dummy entry (205) are used.