Patterned media for self-servowriting integrated servo fields

A disk drive comprising:

• a slider including a read head and a write head;
• a disk having a set of tracks on a surface of the disk, the tracks being formed from generally concentric lands of thin film magnetic material separated by grooves, each track in the set including a plurality of sectors that have a data area and at least first and second servo field lands;
• and wherein a centerline of one of the first or second servo field lands is offset by approximately one-half of the track width from a centerline of the data area, and the disk including a bootstrap zone that is concentric with the set of tracks, the bootstrap zone being formed from pre-patterned lands of magnetic material that form servo patterns when DC-magnetized;
• and
• means for writing first and second Integrated Servo sequences on first and second servo field lands respectively using the write head, the first and second Integrated Servo sequences being members of a predetermined sequence set with a plurality of members.

A method of operating a disk drive comprising:

• positioning a read head, which is mounted on an actuator, over a bootstrap zone on a disk with pre-patterned discrete tracks by holding the actuator against a crash stop;
• computing servo compensation required to follow a discrete track with the read head by observing discrete track crossings as the disk rotates under the read head generating signals in the read head;
• moving the read head toward a first discrete track in a data zone on the disk and detecting a change in a signal from the read when the read head leaves the bootstrap zone and enters the data zone which has pre-patterned tandem offset lands in each servo sector;
• moving the read head back toward the bootstrap zone by a number of tracks equal to a read-write head offset to position a write head over the first discrete track of the data zone;
• and
• self-servowriting Integrated Servo sequences for each sector of each discrete track in the data zone by writing a first Integrated Servo sequence on a first servo land that is aligned on a centerline of the discrete track for each servo sector in the track, then stepping one-half track width out and writing the second Integrated Servo (IS) sequence for each servo sector in the track.