| 摘要 |
PROBLEM TO BE SOLVED: To quickly retrieve a unit storage area in recording/reading a file stored in a recording medium. SOLUTION: In performing access to a file, a jump table retrieving part 75 retrieves a unit recording area number corresponding to a unit recording area to which desired data are assigned or a unit recording area number close to the desired data from a jump table 78, and a unit recording area retrieving part 72 retrieve the unit recording area including the desired data by referring to a file management table 74 based on the retrieved unit recording area number, and an access part 71 reads the data recorded in the unit recording area.
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