1. Field of the Invention
The present invention relates to a magnetic recording media having discrete tracks, a magnetic recording apparatus having the magnetic recording media, and a stamper used to manufacture the magnetic recording media.
2. Description of the Related Art
In recent years, much attention has been paid to discrete track media expected to improve the recording density; in the discrete track media, adjacent recording tracks are separated from one another by guard bands formed of grooves or a nonmagnetic material to suppress the magnetic interference between the adjacent tracks. To manufacture such discrete track media, the patterns of a magnetic layer are desirably formed by an imprint method using a stamper. In this case, if patterns of the magnetic layer corresponding to signals for the servo region as well as the patterns of recording tracks are formed by using the imprint method, it is possible to eliminate the need for a servo track write process, thus reducing costs.
There is a document that refers to position detection marks (an address section) in the servo zone Sz in a discrete track media (Jps. Pat. Appln. KOKAI Publication No. 2004-110896). However, the prior art does not consider adverse effects of fine configuration of the position detection marks (the address section) on signal quality.
The present inventors examined a discrete track media for the quality of address signals obtained from the servo regions. As a result, they have found that, in some cases, quality of the address signals is made insufficient with a high noise level. A probable cause is that when two magnetic patterns used as address bits on servo regions corresponding to two adjacent recording tracks are arranged so that one corner of one of the magnetic patterns is almost in point-contact with one corner of the other, magnetic fluxes are concentrated on the corners of the magnetic patterns. The concentration of the magnetic fluxes may increase the leakage magnetic field, which in turn may increase the noise.