Patent ID: 6469859
Filing Date: 2002-10-22
Classification: G11B

Abstract:
A self-servowriting system, comprising:a storage medium; a positionable transducer assembly for reading and writing a plurality of tracks, including position information, on the storage medium; a measuring circuit for measuring an indicium of the transducer position; storage for storing a reference value; a determining circuit for determining, while the transducer is moving in a direction transverse to the direction of the tracks, whether the measured indicium has changed in a predefined manner relative to the reference value, and if so, generating an indicator; a servo system for positioning the transducer relative to the storage medium, the servo system substantially halting transverse movement of the transducer relative to the storage medium in response to the indicator; and a controller for updating the reference value when the transducer is positioned at some, but not others, of the tracks written to the storage medium.