DISK RECORDING AND REPRODUCING METHOD

摘要

PROBLEM TO BE SOLVED: To solve a problem that continuous recording reproduction of a moving picture, sound, etc., is stopped and data transfer rate is lowered as a whole when rotation speed of a recording medium is increased from a lowered state in a disk device. SOLUTION: A disk recording and reproducing device 101 stores requested data in a cache buffer 1107 and writes to the recording medium 1102 or transfers to the host device 1109 for a recording or a reproduction request from a host device 1109. A rotation speed control part 2 increases the rotation speed of the recording medium 1102 when the requested data exists in a cache buffer 1107, and a fact that the rotation speed of the recording medium 1102 is lowered by a rotation speed monitoring part 111 and the data of the quantity capable of holding continuity of recording and reproduction is stored in the cache buffer 1107 by a buffer monitoring part 110 is detected.