Patent ID: 8654475
Filing Date: 2014-02-18
Classification: G11B

Abstract:
1. A stamper to be used for manufacturing a bit-patterned medium that includes a plurality of data regions having a plurality of tracks and a servo region located between the data regions, each of the data regions extending in a circumferential direction of the tracks, the servo region extending in a radial direction, the stamper comprising a guide comprising: a first portion provided in regions to be boundaries between the servo region and the data regions in the bit-patterned medium, the first portion extending in a radial direction; and a second portion connected to the first portion, the second portion having protrusions regularly arranged at predetermined intervals in the radial direction, each of the protrusion having and being located on sides of regions to be the data regions, wherein, of angles formed between at least one of two sides of the triangular shape and a straight line extending in the radial direction, the smaller angle is in the range of 10 to 50 degrees, the two sides extending from a vertex of one of the protrusions.