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 {HEAD ~ an information recording layer}, includes a cylinder with 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 { HEAD ~ an information recording layer } , includes a cylinder with a liner and a screw coated with TiC and TiN
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