| 摘要 |
A disk apparatus ( 10 ) includes a spindle ( 62 ) to which a magnetooptical disk ( 60 ) is attached. An FCM is formed on the magnetooptical disk ( 60 ) along a track at intervals of a predetermined period, a laser beam having a different light amount depending on a time of an execution and an interruption of a recording process is incident upon the track. The FCM signal detection circuit ( 36 ) detects an FCM signal based on the laser beam reflected from the track, a comparator ( 42 ) compares a level of the FCM signal and a slice level, and a PLL circuit ( 54 ) generates a clock signal based on a comparison result by the comparator ( 42 ). When a change request between an execution/interruption of the recording process is applied, a predetermined first slice level is set to the comparator ( 42 ) until 200 mili seconds passes since a reception of the change request. When 200 mili seconds passes, a second slice level calculated based on a peak level of the FCM signal is set to the comparator ( 42 ).
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