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Disk drive comprising asynchronous/synchronous gain control for fault tolerant detection of servo sync mark after head switch
Disk drive comprising asynchronous/synchronous gain control for fault tolerant detection of servo sync mark after head switch
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机译:磁盘驱动器包括异步/同步增益控制,可在磁头切换后容错检测伺服同步标记
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摘要
A disk drive is disclosed comprising a plurality of disk surfaces and a plurality of respective heads actuated radially over the disk surfaces. Each disk surface comprises a plurality of tracks, each track comprising a plurality of data sectors and a plurality of embedded servo sectors, each embedded servo sector comprising a servo sync mark for synchronizing to the embedded servo sector. When the disk drive switches heads, a detection window for detecting the servo sync mark is opened early. An asynchronous gain control algorithm prevents a gain control system from diverging while reading an area of the disk surface preceding the servo sync mark, and a synchronous gain control algorithm maintains a proper gain of the read signal while reading the servo sync mark.
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