An apparatus for manufacturing an optical disk substrate having a foreign substances index of not more than 1×105 μm2 /g, {TAIL ~ an optical information storage medium} wherein the substrate has an information recording layer, includes a cylinder with {HEAD ~ a liner} and a screw coated with TiC and TiN 
An apparatus for manufacturing an optical disk substrate having a foreign substances index of not more than 1×105 μm2 /g , { TAIL ~ an optical information storage medium } wherein the substrate has an information recording layer , includes a cylinder with { HEAD ~ a liner } and a screw coated with TiC and TiN
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