Patent ID: 7116510

Claim:
A hard disk drive, comprising: at least one hard disk; an actuator; a secondary actuator, a read/write head corresponding each hard disk; and at least one crash stop for the actuator at least one hard disk having a servo track pitch that is set by (a) positioning the actuator against the crash stop, (b) writing a burst pattern on at least one hard disk while the actuator is positioned against the crash stop and the read/write head is in a first position, (c) changing a bias voltage applied to the secondary actuator by a predetermined bias voltage increment for a predetermined number of times to change the position of the read/write head a corresponding number of times and writing a burst pattern on at least one hard disk at each respective changed position of the read/write head, (d) determining an amount of overlap for at least one selected burst pattern having two burst patterns that are adjacent to the burst pattern, (e) terminating the method for setting the initial servo track pitch when the amount of overlap determined for each selected burst pattern is within a selected criterion of a predetermined target overlap value; (f) increasing the predetermined bias voltage increment when the amount of overlap for each selected burst pattern is greater than the predetermined target overlap value, and decreasing the predetermined bias voltage increment when the amount of overlap for each selected burst pattern is less than the predetermined target overlap value, and (g) repeating steps (a) through (e) with the new predetermined bias voltage increment.