| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a phase servo control system in which phase servo patterns are surely demodulated even during high speed seek. <P>SOLUTION: A disk memory device is configured by having: a disk in which a first phase servo pattern, an in-phase second phase servo pattern and an antiphase third servo pattern are recorded in a servo region, and the third phase servo pattern comprises respective phase servo patterns divided in at least two; and phase servo demodulation means by which a phase servo demodulating process including an integration operation in an integration section of the same ratio is performed from lead signals that a head reads out from the servo region. <P>COPYRIGHT: (C)2012,JPO&INPIT |
