| 摘要 |
PROBLEM TO BE SOLVED: To realize a disk drive device stably applying a tracking servo of a land/groove recording format even to a poor FG precision motor by remarkably reducing a jitter amount of a tracking polarity switching signal. SOLUTION: This disk drive device is provided with a correction means performing the correction of a pulse signal phase reference of a digital PLL part 13 oscillating a pulse signal synchronized with an FG signal being according to a rotational speed of a motor spindle driving an optical disk and performing the correction of a reference value of a comparator 15 comparing a count value according to a motor rotation angle outputted from a rotation angle counter 14 counting the output pulse signal of the digital PLL part 13.
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