Patent ID: 6331342
Filing Date: 2001-12-18
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording medium comprising:a nonmagnetic supporting base having a surface roughness ranging from 8.0 nm to 15 nm;a nonmagnetic layer coated on said nonmagnetic supporting base, the nonmagnetic layer including at least two kinds of carbon black as the only nonmagnetic particles in said nonmagnetic layer, the carbon black having a mean particle size of less than 50 nm and having a thickness, obtained after the nonmagnetic layer is dried, ranging from greater than 0 .mu.m to 0.5 .mu.m but thicker than the mean particle size of the carbon black; anda magnetic layer coated on said nonmagnetic layer, the magnetic layer having a thickness, after the magnetic layer is dried, ranging from 0.5 .mu.m to 2.0 .mu.m.