Patent ID: 7808881
Filing Date: 2010-10-05
Classification: G11B

Abstract:
1. A method of manufacturing an optical recording medium, wherein the optical recording medium includes: wherein a row of pits is formed on the substrate in the sub-information area, wherein the sub-information area is concentrically located closer to a center of the optical recording medium than the main-information area, wherein the method of manufacturing the optical recording medium comprises: wherein the track pitch in the main-information area is at least 0.24 μm wide and at most 0.43 μm wide, and the track pitch in the sub-information area is at least 0.24 μm wide and at most 0.45 μm wide, and wherein the track pitch of the row of pits in the sub-information area is different from the track pitch of the row of pits in the main-information area.