Patent ID: 8908309

Claim:
A hard disk drive, comprising: an enclosure; a disk rotatably mounted to the enclosure, the disk having patterned magnetic media with pre-patterned data tracks that are substantially concentric, and the data tracks have servo sectors with headers, wherein portions of the headers are radially offset from the data tracks by a fraction of a pitch of the data tracks within the servo sector headers, and the fraction of the track pitch comprises an edge dislocation with an odd Burgers vector b; the data tracks are separated by nonmagnetic grooves, with the nonmagnetic grooves and the data tracks including radially offset regions; the servo sector headers include transition regions at a beginning and an end thereof, and space is provided for bursts within the servo sector headers and outside of the servo sector headers, such that the transition regions may be ignored by servo decoders; and an actuator having a transducer for reading data from the data tracks.