| 摘要 |
PROBLEM TO BE SOLVED: To shorten a time up to starting the read even when a change destination area of a secondary change of an optical disk is collected to a specified place. SOLUTION: A CPU 25 of an optical disk device reads in continuously the data from the change destination area of the optical disk 1 at a start operation time when the optical disk 1 is inserted, or when the start operation by a command occurs to store them in a RAM 21, and the read is specified from a host not shown in figure, and when the optical disk 1 is satisfied to the secondary change (SDL) while reading in the user area of the optical disk 1, the CPU 25 retrieves the presence of a sector specified to the RAM 21 storing the data of the change destination area, and transfers the data of the change destination from the RAM 21 in the case of specifying.
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