Patent ID: 7648620

Claim:
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 t 1 on a surface of the reverse die; an initial electroforming step to form a first plated layer with a thickness t 2 equal to or more than the thickness t 1 of the conductive layer by plating a surface of the conductive layer at a current density of 0.35 A/dm 2 or less; a main electroforming step to form a second plated layer with a thickness t 3 by plating a surface of the first plated layer at a current density of 15.3 A/dm 2 or more; and a final electroforming step to form a third plated layer by plating a surface of the second plated layer at a current density of 5.2 A/dm 2 or less.