Patent ID: 6852432

Claim:
A magnetic recording media formed of a magnetic alloy layer of Co as the main component on a substrate, through an under-layer, a protective layer and a lubricant layer, stacked in this order said media comprising: plural under-layers including a first under-layer that is substantially amorphous and a second under-layer that is a crystalline layer, stacked in this order, and a Δ BH[0.01, 50] defined by |BH[0.01%]−BH[50%]|, as the difference between a height BH[0.01%] where a Bearing ratio is 0.01% and a height BH[50%] where a Bearing ratio is 50%, that is not less than 3 nm and not more than 6 nm, where a Bearing Curve is given by a surface roughness curve of said magnetic recording media.