Patent ID: 7296478
Filing Date: 2007-11-20
Classification: B82Y,G11B,Y10T

Abstract:
1. A method for inspecting a master carrier for magnetic transfer, said master carrier comprising: a support having a transfer-recording pattern arrayed in a track direction of said master carrier in accordance with information to be transferred to a magnetic recording medium; a magnetic layer on said transfer-recording pattern of said support; and a disk surface having a hill and a valley, which result from a warp of said master carrier, the method comprising the steps of: measuring an in-plane distance between a top of said hill and a bottom of said valley with respect to said disk surface, and a vertical-direction distance between the top of said hill and the bottom of said valley with respect to said disk surface; and judging whether said master carrier is good or not based on a relation of said in-plane distance, said vertical-direction distance, and the thickness of said master carrier, wherein the step of judging is based on whether or not said in-plane distance L (mm) between the top of said hill and the bottom of said valley, said vertical-direction distance H (μm) between the top of said hill and the bottom of said valley to said disk surface, and said thickness d (mm) of said master carrier satisfy the following formula: