Patent ID: 7283457

Claim:
An optical recording medium including a layer with grooves and/or pits as a first depressions and protrusions, of which width is equal to or less than 200 nm, in a main information recording area; and said optical recording medium also including, in the same layer as the first depressions and protrusions, grooves and/or lands as a second depressions and protrusions in an inner or outer peripheral area with respect to the main information recording area, the grooves and/or lands as the second depressions and protrusions being able to be tracked by an optical system in which a laser wavelength thereof is 780±10 nm, and a numerical aperture NA of the recording and playback lens of is 0.45±0.01, and wherein the grooves and/or lands as the second depressions and protrusions are configured to indicate mechanical precision information of the optical recording medium when the optical recording medium is evaluated by a mechanical precision measuring device.