Patent ID: 7773323
Filing Date: 2010-08-10
Classification: B82Y,G11B

Abstract:
1. A magnetic recording medium on which are formed: servo patterns formed in servo pattern regions on at least one surface of a substrate by patterns including recording regions and non-recording regions; and data track patterns where a plurality of data recording tracks are formed with a predetermined track pitch in data recording regions on the at least one surface, wherein M sets of burst patterns are formed along a direction of rotation of the substrate in a burst pattern region in each servo pattern region, where M is a natural number of two or higher, each burst pattern is formed so as to include two types of burst signal units and (2M) centers in a radial direction of the substrate of the burst patterns are present in a predetermined range at intervals of (1/N) times the track pitch in the radial direction, the predetermined range has a first end and a second end and further has a length along the radial direction of (2M/N) times the track pitch (where N is a natural number of two or higher), and the first and second ends in the radial direction of the predetermined range do not match a center in the radial direction of the burst pattern, the two types of burst signal units are formed so that a length along the radial direction of a first type of burst signal units out of the two types of burst signal units is equal to a length along the radial direction of a second type of burst signal units out of the two types of burst signal units, and a distance from a center of the data track pattern to a center in the radial direction of the first type of burst signal units differs from a distance from a center of the data track pattern to a center in the radial direction of the second type of burst signal units, and the two types of burst signal units are constructed by the non-recording regions so that the first type of burst signal units and the second type of burst signal units out of the two types of burst signal units do not overlap in the direction of rotation, centers in the radial direction of the burst signal units of a same type are separated in the radial direction by (2·M/N) times the track pitch, centers in the radial direction of the first type of burst signal units and centers in the radial direction of the second type of burst signal units are separated in the radial direction by (M/N) times the track pitch, and in at least one part out of regions from an inner periphery region to an outer periphery region of the substrate, end regions including end parts positioned close to the second type of burst signal units out of both end parts in the radial direction of the first type of burst signal units and end regions including end parts positioned close to the first type of burst signal units out of both end parts in the radial direction of the second type of burst signal units overlap in the radial direction.