Patent ID: 8124257

Claim:
A magnetic recording medium that has a disc shape with a center hole, comprising: a silicon single-crystal supporting member having a main face, a substrate inner periphery end face adjacent to the center hole, a substrate inner periphery chamfer portion adjacent to the main face and to the substrate inner periphery end face, a substrate outer periphery end face positioned on a side of the main face opposite the substrate inner periphery end face, and a substrate outer periphery chamfer portion adjacent to the main face and to the substrate outer periphery end face; an SiO 2 film formed on the silicon single-crystal supporting member; and a magnetic recording layer formed on the supporting member for the magnetic recording medium; wherein a thickness of the SiO 2 film on the main face ranges from 2 nm to 8 nm, and a thickness of the SiO 2 film on the substrate inner periphery end face and the substrate inner periphery chamfer portion ranges from 50 nm to 200 nm.