Patent ID: 7529059
Filing Date: 2009-05-05
Classification: G11B

Abstract:
1. A method comprising: sensing a first burst servo pattern on a portion of a track of a rotatable medium used for data storage, wherein the sensed first burst servo pattern is one of a plurality of first burst servo patterns that are disposed radially across the rotatable medium on each half track of each track of the rotatable medium and in which all first burst servo patterns have a same phase relationship; sensing a second burst servo pattern on the portion of the track of the rotatable medium following the sensed first burst servo pattern, wherein the sensed second burst servo pattern is one of a plurality of second burst servo patterns in which a corresponding second burst servo pattern follows each first burst servo pattern on each half track and in which all second burst servo patterns across two adjacent tracks have different phases; determining a phase difference between the sensed first burst servo pattern and the sensed second burst servo pattern; and locating head radial position based on the phase difference between the sensed first burst servo pattern and the sensed second burst servo pattern.