Patent ID: 8755140

Claim:
An apparatus comprising: clock circuitry configured to produce a write clock signal and a servo clock signal; circuitry configured to process a waveform produced by a read head operated with respect to a recording medium, the medium comprising magnetic data positions arranged on tracks, the tracks comprising a first track and a second track; circuitry configured to produce, based on the waveform, a servo detect pulse that indicates a detection of servo data on the first track; circuitry configured to measure a timing difference that is based on the servo detect pulse and a write pulse of the write clock signal; circuitry configured to control an adjustment of a phase of the write clock signal based on the timing difference to align the write clock signal with at least a portion of the data positions; and circuitry configured to control a write head to write to one or more data positions of the second track based on the write clock signal while the servo clock signal is servo locked on the first track.