Patent ID: 7633697

Claim:
A magnetic disk drive comprising: a magnetic disk including a plurality of servo wedges and a plurality of tracks, at least one of the plurality of tracks for at least one of the plurality of servo wedges including servo data that is perpendicular magnetic recoded thereon, the servo data including a preamble, a servo address mark, at least one burst region, and a track identification number that is repetition coded by replicating each bit of data with n consecutive identical data bits, where n is an integer great than 1; a read/write head having a position controlled by a plurality of drive devices; a read/write channel, operably coupled to the read/write head, that reads the servo data from the disk drive; a servo formatter, operably coupled to the read/write channel, that generates timing and position signals based on the servo data that is read; and a device controller, operably coupled to the servo formatter, that controls the operation of the plurality of drive devices based on the timing and position signals.