Patent ID: 7986488

Claim:
A perpendicular magnetic recording disk comprising: a magnetic recording layer magnetizable generally perpendicular to the plane of the layer for the recording of data in a plurality of generally concentric circular data tracks, wherein the circular data tracks are radially spaced apart by a track pitch (Tp) radial spacing; and a plurality of nondata servo sectors extending generally radially across a plurality of the data tracks, the servo sectors including position error signal (PES) blocks forming a PES pattern comprising: a first field of PES blocks having a radial height of Tp and extending generally radially across the tracks, each PES block in the first field having a perpendicular magnetization in one and only one direction and opposite to the perpendicular magnetization of radially adjacent PES blocks in the first field; and a second field of PES blocks having a radial height of Tp and extending generally radially across the tracks, the second field being circumferentially adjacent to and shifted radially relative to the first field by Tp whereby each PES block in the second field is circumferentially aligned with a PES block in the first field, each PES block in the second field having a perpendicular magnetization in one and only one direction and opposite to both the perpendicular magnetization of radially adjacent PES blocks in the second field and to the perpendicular magnetization of the circumferentially adjacent PES block in the first field.