Patent ID: 7408735
Filing Date: 2008-08-05
Classification: G11B

Abstract:
1. Apparatus, for use in connection with a data read/write device, which can avoid instability during data track following, comprising: a data recording disk having a plurality of tracks and having servo information, said servo information including a plurality of servo bursts having nominal sizes, wherein said plurality of servo bursts define null points; a head positionable near a destination location, with respect to said tracks, by a head positioning device under control of a controller; circuitry which: obtains first information indicative of characteristics of said head positioning device and characteristics of said controller; obtains second information indicative of repeatable runout for at least a portion of at least a first of said tracks; and, calculates at least a first correction value using said first information and said second information by a process which includes calculating a value indicative of change of at least a first servo burst component size from a nominal burst component size.