Patent ID: 7355810

Claim:
A disk drive comprising: a magnetic disk medium including servo regions, in which servo information for position detection of a head performing recording and playback of user data is embedding-recorded by discrete track recording method, the servo information including a preamble section, a cylinder address code section, and phase-difference burst pattern sections to detect an offtrack amount, one phase-difference servo burst pattern section being provided in each of the servo regions, a servo burst pattern having an inclined direction corresponding to a direction of an inline angle of the head and a phase which gradually delays toward an internal periphery of the disk medium and gradually advances towards an external periphery of the disk medium; a read head which is included in the head and reads the servo information and the user data from the magnetic disk medium; and control means for performing positioning control of the head in accordance with the servo information played back from the servo regions by using the read head.