Patent ID: 9001455
Filing Date: 2015-04-07
Classification: G11B

Abstract:
1. A magnetic recording medium comprising: a magnetic layer having a servo signal recorded thereon by magnetizing a part of the magnetic layer in a first direction, the first direction containing a component of a perpendicular direction that is perpendicular to a top surface of the magnetic layer, the magnetic layer being pre-magnetized in a second direction before recording of the servo signal, the second direction containing the component of the perpendicular direction, which second direction is opposite to the first direction, an absolute value of the product of (1) a rate of an amount of magnetization in the perpendicular direction with respect to a maximum amount of magnetization that would be obtained if amounts of magnetization of the magnetic recording medium were measured while turning the magnetic recording medium and (2) a squareness ratio of the magnetic layer in a longitudinal direction that is parallel to the top surface being 0.05 or more and 0.25 or less.