Method and apparatus for writing clock data to a storage medium
AssigneeXyratex Technology Limited
InventorMichael A. Miles
Life of this patent
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Abstract
In a method of writing clock data to a storage medium whilst the storage medium is rotating, a burst of clock data is read from a present track. A burst of clock data for a subsequent track on the storage medium is generated in accordance with the burst of clock data read from the present track and its phase adjusted. The phase adjusted burst of clock data is written to the subsequent track. The steps are repeated for plural bursts of clock data around a revolution of the storage medium thereby to write clock data to the subsequent track.
Claims9
A method of writing clock data to a storage medium whilst the storage medium is rotating, the method comprising:
- (A) reading a burst of clock data from a present track;
- (B) generating a burst of clock data for a subsequent track on the storage medium in accordance with the burst of clock data read from said present track;
- (C) measuring the phase error introduced on reading said burst of clock data from the present track and adjusting the phase of the generated burst of clock data on the basis of the phase error introduced on reading the burst of clock data from the present track;
- (D) writing said phase adjusted burst of clock data to said subsequent track;
- and,
- (E) repeating steps (A) to (D) for plural bursts of clock data around a revolution of the storage medium thereby to write clock data to said subsequent track.
Apparatus for writing clock data to a storage medium whilst the storage medium is rotating, the apparatus comprising:
- a data reader for reading a burst of clock data from a present track;
- a pattern generator for generating a burst of clock data for a subsequent track on the storage medium in accordance with the burst of clock data read from said present track;
- a phase error adjuster for adjusting the phase of the generated burst of clock data on the basis of the phase error introduced on reading the burst of clock data from the present track;
- and,
- a data writer for writing said phase adjusted burst of clock data to said subsequent track;
- the apparatus being adapted to read a burst of clock data from a present track, generate a burst of clock data for a subsequent track on the storage medium in accordance with the burst of clock data read from said present track, adjust the phase of the generated burst of clock data on the basis of the phase error introduced on reading the burst of clock data from the present track, and write the phase adjusted burst of clock data to said subsequent track for plural bursts of clock data around a revolution of the storage medium thereby to write clock data to said subsequent track.
Dependencies are inferred from the claim text.