Patent ID: 7667920
Filing Date: 2010-02-23
Classification: G11B

Abstract:
1. A method for correcting a track pitch error in servo tracks written on a magnetic recording media coupled with a disk surface by using a subsequent servo-write pass, said method comprising: propagating in a previous servo-write pass across said magnetic recording media, servo tracks having radial positioning servo code, whereby a magnetic transducer is enabled to be positioned to at least one radial position on said magnetic recording media; calculating at least one corrected radial reference point for said track pitch error written on said magnetic recording media by identifying at least one inconsistency between a mechanical response of an actuator and a track pitch, whereby a corrected location for at least one said servo track is identified; comparing a recorded gain of a servo loop from said previous servo-write pass with a servo gain of a servo loop from a reference servo system; and propagating with said subsequent servo-write pass at least one new servo track at said corrected location.