| 摘要 |
PROBLEM TO BE SOLVED: To extend battery operation time by backing up data to a buffer memory consisting of a volatile memory and holding an index data and then shifting the device to a power saving mode thereby eliminating power supply burden. SOLUTION: At the period when access to a loaded disk 2 is stopped, the index data held in a buffer memory 8 is saved in a working memory 25, then power supply to the buffer memory 8 is interrupted to be shifted to a power saving mode, and thereby power consumption is reduced without losing TOC data. In addition, when a reproducing command is received, since the power supply to the buffer memory 8 is resumed and then the index data saved in the working memory 25 is returned to the buffer memory 8, the index data can completely managed and stored.
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