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1.发明公开公开(公告)号：US20230186948A1
公开(公告)日：2023-06-15
申请号：US18165363
申请日：2023-02-07
Applicant: SHOWA DENKO K.K.
Inventor： Sunao KAKITA , Tahahiro KUSHINO , Hidenori INADA
CPC classification number: G11B5/73921 , G11B5/8404 , G11B5/82
Abstract: 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.
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