Patent ID: 8687312
Filing Date: 2014-04-01
Classification: G11B

Abstract:
1. A method of detecting an edge of a usable region of a disk of a disk drive, the method comprising: generating an adaptive control signal to cause a recording head of a disk drive to move in a repetitive motion to counteract eccentricity; processing a plurality of first values of a signal usable to control actuation of the recording head of the disk drive with respect to a disk of the disk drive, the first values corresponding to recording head positions not in proximity to an edge of a usable region of the disk, the disk comprising a plurality of tracks eccentrically arranged with respect to the center of the disk, and the recording head configured to move in a repetitive motion; processing one or more second values of the signal corresponding to recording head positions in proximity to the edge; determining an edge detection threshold condition by calculating a cross-correlation between the plurality of first values of the signal; and determining a deviation in the repetitive motion of the recording head in response to the processing of the plurality of first values of the signal and the processing of the one or more second values of the signal by processing the one or more second values of the signal to determine whether the threshold condition has been satisfied, the deviation in the repetitive motion indicating that the recording head has reached an edge of the usable region of the disk, wherein the method is performed at least in part using a controller of the disk drive.