Patent ID: 6316077
Filing Date: 2001-11-13
Classification: G11B,Y10T

Abstract:
A magnetic recording medium which comprises a support having thereon a substantially nonmagnetic lower layer and a magnetic layer comprising a ferromagnetic metal powder or a ferromagnetic hexagonal ferrite powder dispersed in a binder provided on the lower layer, which is a magnetic recording medium for recording signals of from 0.17 to 2 G bit/inch.sup.2 of areal recording density, wherein the magnetic layer has the central plane average surface roughness (Ra) of the measuring range of 121 .mu.m.times.92 .mu.m of 5.0 nm or less and that of the measuring range of 1.2 mm.times.0.9 mm of from 8.5 to 21.5 nm measured using an optical interference surface roughness meter.