Patent ID: 8168311

Claim:
A magnetic recording disk comprising: a substrate having a generally planar surface; a plurality of elevated lands formed of perpendicular magnetic recording material on the substrate, the lands having an upper surface above the substrate surface; a plurality of recesses on the substrate between the lands, the recesses having sidewalls and a lower surface lower than the upper surface of the lands; nonmagnetic fill material in the recesses in direct contact with the sidewalls and lower surfaces of the recesses, the fill material having an upper surface; and a multilayered overcoat on the upper surfaces of the lands comprising a first overcoat layer on and in contact with the lands and a second overcoat layer on and in contact with the first overcoat layer, the second overcoat layer formed of a material different from the material of the first overcoat layer and having a chemical-mechanical polishing (CMP) removal rate less than the CMP removal rate of the fill material, the upper surface of the second overcoat layer and the upper surface of the nonmagnetic fill material in the recesses being substantially coplanar; and a layer of lubricant on and in contact with the second overcoat layer and the upper surface of the nonmagnetic fill material in the recesses.