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Abstract

Systems and techniques relating to control of magnetic devices are disclosed. A described technique includes receiving a waveform via a head about a recording medium which includes data tracks and servo regions, detecting a servo region based on the waveform becoming an alternating signal, which is indicative of the head's path over discrete radially arranged magnetic strips in the servo region; performing a frequency synchronization of a read clock based on the detection to establish a frequency lock; performing a phase synchronization of the read clock to align a phase of the read clock with respect to acquired samples of the alternating signal; performing a synchronization of a write clock based on a write of a test sequence to the medium, the write clock being responsive to the frequency lock and the read clock; and writing, using the synchronized write clock, data to the medium for servo control.

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First Claim