Showa Denko K.k.

Resonac Hard Disk Corporation

Hidenori Inada

Katsuhiro Yoshimura

Takahiro Kushino

Yasuyuki Nakanishi

Sunao Kakita

A dummy substrate is formed with a disk-shaped glass substrate having a center hole, and a magnetic recording film on an outer circumferential surface along a thickness direction of the glass substrate and an inner circumferential surface of the center hole, and a surface roughness (Ra) of one surface and the other surface of the glass substrate is in a range of 0.2 nm or more and 100 nm or less.

Dummy substrate and manufacturing method thereof

There is provided a method of producing a substrate for magnetic recording media which is capable of efficiently removing alumina abrasive grains in the latter polishing step that have been stuck in the former polishing step during polishing of the substrate for magnetic recording media in which a NiP plating film has been formed on the surface of an Al alloy substrate,

Growing community of inventors

Oyama, Japan

Hidenori Inada