Locking a disk-locked clock using timestamps of successive servo address marks in a spiral servo track
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United States of America Patent
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Mar 8, 2016
Grant Date -
Oct 1, 2015
app pub date -
Apr 3, 2014
filing date -
Mar 28, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Described embodiments provide a magnetic mass storage device with a system clock phase-locked to servo address marks on the magnetic disk. A head sequentially reads multiple adjacent servo address marks in a spiral track of servo address marks. When a servo address mark detector detects a mark, the count value of a counter driven by the system clock is sampled and held by a latch. A system clock synthesizer calculates differences in value between successively sampled count values from the latch, averages the differences in value to create an average difference value, and normalizes a difference between the average difference value and a target value to create a phase error value. The phase of the system clock is updated using the phase error value.
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