| 摘要 |
Even if an external disturbance resulting from a defect on a magneto-optical disk disturbs a loop for generating a reference clock and consequently a phase error is increased, it is possible to prevent data from being recorded on a magneto-optical disk by using an abnormal reference clock. A disk apparatus according to the present invention includes a rotating and driving means for rotating and driving a disk, data recording/reproducing means having a head which can be moved in the radial direction of the disk for recording and reproducing data on and from the disk, reference clock information generating means for generating a reference clock information utilized when data is recorded on and reproduced from the disk, clock control means for generating a phase error information indicative of a phase error between a phase information obtained based on rotation of the disk and the reference clock information and for controlling the reference clock generating means based on the phase error information, threshold value discriminating means for discriminating whether the phase error exceeds a predetermined threshold value, and data recording/reproduction control means for controlling the data recording/reproducing means based on an output result of the threshold value discriminating means.
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