| 摘要 |
According to one embodiment, a disk storage apparatus includes a disk and a servo demodulator. The disk has a servo area, in which a first phase servo pattern, a second phase servo pattern that is in phase with the first servo pattern, and a third servo pattern that is inverse in phase to the first and second servo patterns. The third servo pattern comprises at least two phase servo pattern segments. The servo demodulator is configured to perform a phase servo demodulating process that includes integration operation on integration sections of the same ratio, using a read signal read from the servo area by a head.
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