Patent ID: 6291052
Filing Date: 2001-09-18
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording medium which comprises a support having thereon a substantially nonmagnetic lower layer and a magnetic layer provided on said lower layer, said magnetic layer comprising a ferromagnetic metal powder or a ferromagnetic hexagonal ferrite powder, a lubricant, and an abrasive dispersed in a binder said medium capable of recording data at an areal recording density of from 0.17 to 2 G bit/inch.sup.2 said magnetic layer having a coercive force of 1,800 Oe or more, and said support having a thickness unevenness of 5% or less of the thickness of said support and the ratio of the spatial frequency intensity in long wavelength of from 10 to 2 .mu.m of the surface roughness of said magnetic layer (I.sub.L) to the spatial frequency intensity in short wavelength of from 1 to 0.5 .mu.m of the surface roughness of said magnetic layer (I.sub.S), (I.sub.L /I.sub.S), is less than 1.5.