Patent ID: 7372650

Claim:
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 (SSM N ); 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 (SSM C ), wherein the calibration SSM C includes a pattern that is different than a pattern associated with the normal SSM N ; 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 SSM N 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 SSM C associated with a calibration servo wedge.