| 摘要 |
A disk reproducing apparatus that includes: a first rotation control unit that applies a constant drive voltage to a spindle motor to thereby rotate an optical disk; a measuring unit that measures the length of the longest bit included in an EFM signal on information data reproduced from the optical disk based on a reference clock; a calculating unit that calculates the number of rotations of the optical disk from the longest bit length measured by the measuring means; and a setting unit that, based on a mutual relationship between the drive voltage of the spindle motor and the number of rotations of the optical disk, sets a gain of a motor drive IC according to the number of rotations of the optical disk calculated by the calculating unit.
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