Patent ID: 8064157

Claim:
A magnetic disk having a magnetic part in a nonmagnetic region, comprising: a data recording region having first magnetic parts; the first magnetic parts being arranged in a circumferential direction in the nonmagnetic region and form tracks, and the tracks being arranged in a radial direction at a track pitch Tp; and a burst pattern region having burst patterns making a magnetic head follow the first magnetic parts, the burst patterns having second magnetic parts, the second magnetic parts forming base units arranged at a pitch Sp in a radial direction of the disk, the pitch Sp being more than twice as large as the track pitch Tp and less than four times as large as the track pitch Tp, the base units comprising a plurality of base units arranged in a circumferential direction of the disk, and the base units adjacent to each other in the circumferential direction being displaced from each other variously by both ½ and ¼ of the pitch Sp in the radial direction of the disk.