Patent ID: 7880990
Filing Date: 2011-02-01
Classification: B82Y,G11B

Abstract:
1. A patterned-media perpendicular magnetic recording disk comprising: a plurality of generally concentric circular data tracks, each data track having data sectors and nondata regions, the data sectors containing discrete magnetizable data islands and at least one nondata region containing a pattern of one or more of discrete magnetized nondata islands and discrete nonmagnetic gaps, said pattern representing a scrambled number; and a plurality of angularly spaced synchronization marks extending generally radially across the tracks, each synchronization mark being associated with a data sector, and wherein the spacings between the synchronization marks and the associated data sectors in the tracks are nonmagnetic regions, wherein each spacing between a synchronization mark and its data sector in a track contains a pattern of nonmagnetic gaps representing a scrambled phase shift of the associated data sector in its track.