Patent ID: 6858328

Claim:
A master information carrier used for recording information signals on a magnetic recording medium, comprising a non-magnetic substrate; a pattern of a ferromagnetic film which is disposed on the surface of the non-magnetic substrate, the pattern being disposed in the track length direction so as to correspond to uniform and non-uniform arrangements of the information signals; and a non-magnetic solid material filled in portions between respective neighboring ferromagnetic film areas composing the pattern, top surfaces of the ferromagnetic films and the non-magnetic solid material forming a substantially flat surface, wherein the ferromagnetic film comprises a material selected from the group consisting of Co, Fe, and an alloy comprising Co or Fe as the main component, and the non-magnetic solid material is selected from the group consisting of SiO 2 , Al 2 O 3 , Cu, Ag and an alloy comprising Cu or Ag as the main component.