Patent ID: 7697406

Claim:
An optical disk comprising: a groove; and a land, wherein data is recorded only on the land, wherein the disk is configured to receive a light beam having a wavelength of 405 nm and which light beam has been converged by a lens having a numerical aperture of 0.85 for writing the data to the disc and reading the data from the disk; wherein a pitch of the groove and a pitch of the land are 0.32 μm or more, wherein the groove comprises a plurality of wobble patterns representing address information, and wherein the optical disk has a data format efficiency of 80% or more, the data format efficiency being defined by a ratio of a user data capacity that can be used by a user to a total data capacity of the optical disk, and wherein the user data is one of a plurality of data types; the user data is organized into a plurality of user data sets; and the data efficiency is achieved with a format in which types of the plurality of data types other than the type of the user data are added to each of the plurality of user data sets.