Disk drive calibrating fly height during startup by reading spacing pattern in servo sectors

摘要

A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of normal servo tracks each comprising a plurality of normal servo sectors storing head position information, and a fly height calibration servo track comprising fly height calibration servo sectors, each fly height calibration servo sector comprising head position information and a spacing pattern. After positioning the head over the fly height calibration servo track, the head is servoed over the fly height calibration servo track in response to the fly height calibration servo sectors. A dynamic fly height (DFH) setting is calibrated for the DFH actuator in response to the spacing pattern in the fly height calibration servo sectors. After calibrating the DFH setting, the control circuitry seeks the head to a data track defined by at least one of the normal servo tracks, and startup data is read from the data track.

主权项

1. A disk drive comprising:
a disk comprising a plurality of servo tracks including:
a plurality of normal servo tracks each comprising a plurality of normal servo sectors comprising head position information; anda first fly height calibration servo track comprising fly height calibration servo sectors, each fly height calibration servo sector comprising head position information and a spacing pattern,wherein the normal servo sectors do not comprise the spacing pattern; a head actuated over the disk; a dynamic fly height (DFH) actuator operable to control a fly height of the head over the disk; and control circuitry operable to execute a startup operation by:
positioning the head over the first fly height calibration servo track;servoing the head over the first fly height calibration servo track in response to the fly height calibration servo sectors;calibrating a DFH setting for the DFH actuator in response to the spacing pattern in the fly height calibration servo sectors;after calibrating the DFH setting, seek to a data track defined by at least one of the normal servo tracks; andreading startup data from the data track.