MAGNETIC-DISK GLASS SUBSTRATE, MAGNETIC DISK AND METHOD FOR MANUFACTURING MAGNETIC-DISK GLASS SUBSTRATE
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United States of America
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Sep 14, 2017
app pub date -
May 30, 2017
filing date -
May 30, 2017
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Abstract
A magnetic-disk glass substrate of the present invention includes a pair of main surfaces, a side wall surface, and a chamfered surface between the main surfaces and the side wall surface. Regarding surface properties of at least one of the side wall surface and the chamfered surface of the glass substrate, an arithmetic average roughness (Ra) is 0.015 gm or less, and a bearing factor of a roughness cross-sectional area when a roughness percentage is 60% is 95% or more in a bearing curve of a roughness cross-sectional area.
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