| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved optical disk system. SOLUTION: The optical disc drive apparatus includes mechanics, optics, electronic circuitry, and software code for implementing a method of disc rotation. One such method includes the changing of the rotational rate of a storage medium by applying a force to the storage medium to change the rotational rate from an initial rotational rate toward a first upper limit. The first upper limit is between the initial rotational rate and a desired rotational rate. A first signal is generated when the rotational rate exceeds the first upper limit. A second signal is generated when the rotational rate exceeds a lower acceptable limit of the desired rotational rate. The application of force is then terminated. To terminate the application of force, a second upper limit may be set at an upper acceptable limit of the desired rotational rate, a lower limit may be set at the lower acceptable limit of the desired rotational rate, and the application of force may be terminated when the rotational rate is greater than the lower limit. COPYRIGHT: (C)2003,JPO
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