| 摘要 |
PROBLEM TO BE SOLVED: To make the discriminable a disk in its early stages with a simple constitution. SOLUTION: The reproducing device is set to either one of the DVD(digital video disk) process mode or the CD(compact disk) process mode. At this time, the disk 100 is rotated at a constant linear speed, and the rotation frequency of a disk motor 101 is detected by a control part 130. The rotation frequency at the time when the DVD is mounted, is made lower than the rotation frequency at the time when the CD is mounted.
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