| 摘要 |
A data processing apparatus comprising a motor for revolving a disc-shaped recording medium by a given rate of revolution signal, a mechanism for storing data in and reproducing data from a specific region of the recording medium in response to a data storing/reproducing frequency signal, a circuit for selecting a constant mode or variable mode for the rate of revolution signal and supplying it to the motor, and a circuit for selecting a constant mode or variable mode for the frequency signal and supplying it to the storing/reproducing mechanism.
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