Method for selecting a material suitable for a substrate for information recording media, material selected using this method, and magnetic disk formed using this material

摘要

A method for seeking, from an outer circle radius a, an inner circle radius b, and a thickness h of a disc substrate and a deflection Wmax permissive at a time of rotation, a specific elastic modulus G that a material forming the substrate has, The material for providing a substrate for information recording media having a thickness h of 0.6 millimeter and a deflection Wmax of 1.4 micrometer has a specific elastic modulus G satisfying above Formula (1).