Patent ID: 6791778
Filing Date: 2004-09-14
Classification: G11B

Abstract:
A hard disk drive, comprising:a housing; an actuator arm mounted to said housing; a head mounted to said actuator arm; a disk attached to a spin motor said disk having a plurality of tracks, each of said tracks having a first sector and a second sector, each sector having a servo bit, each servo bit provides a burst signal when read by the head; and, a controller coupled to said head to control the reading of the servo bits, said controller to read said servo bits for the first and second sectors, said controller to determine a burst measure for said first sector that is a function of the burst signal of the servo bit for the first sector, said controller to compare said burst measure for said first sector to a reference value to identify a potential defect, said reference value being a function of the burst signals for the first and second sectors.