Patent ID: 6178054
Filing Date: 2001-01-23
Classification: G11B

Abstract:
A method for selecting optimum write thresholds for a disc drive of the type having a controllably positionable head adjacent tracks defined on a recording surface of a rotatable disc, wherein the disc drive subsequently inhibits writing of data when the head is disposed at positions beyond the write thresholds, the method comprising steps of:(a) writing data to a selected track while maintaining the head at a position away from a center of the selected track equal to a first off-track center distance;(b) reading the data written in step (a) while maintaining the head at a position nominally over the center of the selected track and measuring resulting read error performance;(c) repeating steps (a) and (b) using a second off-track center distance; and(d) selecting the optimum write thresholds for the selected track from the measured read error performance for the first and second off-track center distances.