Patent ID: 8300340
Filing Date: 2012-10-30
Classification: B82Y,G11B

Abstract:
1. A disk-like magnetic recording medium comprising: a servo area along an arc corresponding to a locus when a reproduction head moves on the magnetic recording medium in a cross track direction, the servo area comprising magnetic dots aligned at a pitch (L0), wherein the magnetic dots comprise at least m magnetic dot regions in the cross track direction, where m is natural number equal to 2 or more, the magnetic dots formed on a surface of a magnetic recording layer by a method comprising: wherein a width (Wm) in a down track direction of an m-th magnetic dot region from an innermost circumference of the magnetic recording medium, among the at least m magnetic dot regions, and a number of dot rows (Nm) in the down track direction of the m-th region satisfy the expression (1), and the magnetic dots satisfying the expression (1) are in a preamble portion, wherein L0 ranges from 17 to 45 nm, and Nm is not more than 6.