Patent ID: 7529058
Filing Date: 2009-05-05
Classification: G11B

Abstract:
1. A track pitch examination method of a storage apparatus comprising: a target position path generation step of generating a target position path which varies a target track position so that the position crosses a track; a head position control step of subjecting a head actuator to feedback control so that a head detection position tracks the target position path; and a track pitch determination step of determining track pitch abnormality when an error between the target position path and the head detection position exceeds a predetermined threshold value, wherein in the target position path generation step, as the target position path, a target position sine-wave path, which has an amplitude of the width of one or plural tracks and causes a target track position to undergo sine variation in plural cycles per one rotation of a medium, is generated; in the head position control step, the head actuator is subjected to feedback control so that the head detection position tracks the target position sine-wave path; and in the track pitch determination step, the error between the target position sine-wave path and the head detection position is detected, and track pitch abnormality is determined with respect to a track at which the error exceeds a predetermined threshold value.