Patent ID: 7663838

Claim:
A production method for a magnetic recording medium comprising: forming thin films on a substrate using a sputtering method with a target, wherein the target on which an annular-shaped erosion area is formed during sputtering and a substrate holder on which a plurality of substrates are mounted are installed, opposed in parallel, in a manner such that center axes of the target and the substrate holder align with each other, and the substrates are mounted on the substrate holder in positions such that R 3 /R 1 is 1.1 or smaller and R 4 is R 2 or greater to form thin films, where R 1 is a distance from a deepest recess in the annular-shaped erosion area to the center of the target, R 2 is a distance from an innermost circumference of the annular-shaped erosion area to the center of the target, R 3 is a longest distance from an end of an outside diameter of a substrate to the center of the substrate holder, and R 4 is a shortest distance from the end of the outside diameter of the substrate to the center of the substrate holder.