| 摘要 |
Even if an assumed value of a track pitch and an actual value thereof are different from each other, an optical pickup (2) can be positioned at a target position at high speed, which can realize higher-speed access. A drive-means control apparatus according to the present invention includes a target position calculating means (58) for calculating a target track number based on a head logic address of a track to be accessed, a current position calculating means (60) for calculating a current track number based on a current address, a number-of-tracks calculating means (61) for, based on the target track number and the current track number, calculating the number of tracks by which the optical pickup (2) is to be moved, a step number calculating means (62) for calculating a step number based on the number of tracks, the track pitch (assumed value) and so on, and an assumed value correcting means (65) for correcting the track pitch (assumed value) based on the calculated step number and the number of remaining tracks.
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