Method for manufacturing a master disk for magnetic transfer

Abstract

A method for manufacturing a master disk for magnetic transfer, comprising the steps of electroforming a master substrate of a metal disk with a surface on which an convexoconcave pattern corresponding to information to be transferred is transferred using a reverse die with a reversed convexoconcave pattern, and forming a magnetic layer on the convexoconcave pattern of the master substrate, the method comprising the steps of: a conductive layer forming step to form a conductive layer with a thickness t1 on a surface of the reverse die; an initial electroforming step to form a first plated layer with a thickness t2 equal to or more than the thickness t1 of the conductive layer by plating a surface of the conductive layer at a current density of 0.35 A/dm2 or less; and a main electroforming step to form a second plated layer by plating a surface of the first plated layer at a current density of 0.35 A/dm2 or more.

Dependencies are inferred from the claim text.