Rotating media storage device having a calibration track with unique calibration servo synch marks
AssigneeWestern Digital Technologies, Inc.
InventorHanan Kupferman
Life of this patent
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Abstract
Disclosed is a rotating media storage device (RMSD) that has at least one calibration track with unique calibration servo synch marks (SSMcs). The RMSD includes a disk that comprises a plurality of tracks including a calibration track having a plurality of normal servo wedges distributed around the calibration track. At least one of the normal servo wedges includes a normal servo synch mark (SSMN). Further, at least one calibration servo wedge is distributed between a pair of normal servo wedges. The calibration servo wedge includes a calibration servo synch mark (SSMC). The calibration SSMC includes a pattern that is different than the pattern associated with the normal SSMN.
Claims26
A rotating media storage device (RMSD) comprising:
- a head;
- a disk including:
- a plurality of tracks including a calibration track having a plurality of normal servo wedges distributed around the calibration track, at least one of the normal servo wedges including a normal servo synch mark (SSMN);
- and
- at least one calibration servo wedge distributed between a pair of normal servo wedges, the calibration servo wedge including a calibration servo synch mark (SSMC), wherein the calibration SSMC includes a pattern that is different than a pattern associated with the normal SSMN;
- and
- a synch mark detection circuit having a normal synch mark detection mode and a calibration servo synch mark detection mode, wherein, in the normal synch mark detection mode, the synch mark detection circuit validates a servo synchronization signal based on the head detecting a normal SSMN associated with a normal servo wedge, and in the calibration synch mark detection mode, the synch mark detection circuit validates a servo synchronization signal based on the head detecting a calibration SSMC associated with a calibration servo wedge.
A method for switching a disk drive servo control system from a normal servo mode to a calibration servo mode, the method comprising:
- setting the normal servo mode by setting the servo control system to operate on a normal servo synch mark (SSMN), wherein the normal SSMN includes a first pattern;
- tracking on a normal track using the normal SSMN to search for normal servo sectors;
- seeking to a calibration track;
- tracking on the calibration track in the normal servo mode until an on-track condition is declared;
- then
- setting the calibration servo mode by setting the servo control system to operate on a calibration servo synch mark (SSMC);
- and
- tracking on the calibration track using the calibration servo synch mark SSMC to search for calibration servo sectors, wherein the calibration SSMC includes a second pattern that is different than the first pattern associated with the normal SSMN.
A computer system comprising a host computer and a rotating media storage device (RMSD), the RMSD comprising:
- a disk having a plurality of tracks including a calibration track having a plurality of normal servo wedges distributed around the calibration track, at least one of the normal servo wedges including a normal servo synch mark (SSMN) for synchronizing track-following in a normal servo mode, wherein the normal SSMN includes a first pattern;
- and
- at least one calibration servo wedge distributed between a pair of normal servo wedges, the calibration servo wedge including a calibration servo synch mark (SSMC) for synchronizing track-following in a calibration servo mode, wherein the calibration SSMC includes a second pattern that is different than the first pattern associated with the normal SSMN.
A rotating media storage device (RMSD) including a disk, the disk comprising:
- a plurality of tracks including a calibration track having a plurality of normal servo wedges distributed around the calibration track, at least one of the normal servo wedges including a normal servo synch mark (SSMN) for synchronizing track-following in a normal servo mode, wherein the normal SSMN includes a first pattern;
- and
- at least one calibration servo wedge distributed between a pair of normal servo wedges, the calibration servo wedge including a calibration servo synch mark (SSMC) for synchronizing track-following in a calibration servo mode, wherein the calibration SSMC includes a second pattern that is different than the first pattern associated with the normal SSMN.
Dependencies are inferred from the claim text.