Subastrate for a magnetic disk and method of manufacturing the same

Abstract

In a magnetic disk substrate having first and second chamfered faces respectively connecting between first and second main surfaces opposite to each other and an edge face located between the first and second main surfaces, the ranges of the first and second chamfered faces are specified. Specifically, the distance a from a first boundary portion being a boundary between the first main surface and the first chamfered face to a point of intersection between the first main surface and an extended line of the edge face and the distance b from a second boundary portion being a boundary between the second main surface and the second chamfered face to a point of intersection between the second main surface and an extended line of the edge face are set to satisfy a/b≧1.6.

Dependencies are inferred from the claim text.