Patent ID: 7957253

Claim:
An optical disc to and from which information can be reproduced and recorded by laser irradiation, comprising: a first recording layer in which a first recording mark is formed in a spiral track; and a second recording layer that is behind or in front of a read-side surface of the first recording layer and on which neither a wobble track nor a track for reproducing or recording information by laser irradiation is formed; wherein the second recording layer can be formed with, by laser irradiation, a second recording mark that is positioned in the radial direction of the optical disc according to a predetermined position on the spiral track of the first recording layer, and the second recording layer has a marking region in which a pre-recording mark that is long in the radial direction is formed, on an inner circumferential side or an outer circumferential side from the region in which the second recording mark is formed; the second recording mark includes physical position information for the pre-recording mark; and the physical position information is information on a distance or an angle of the pre-recording mark of the second recording layer, with respect to a fixed position of the first recording mark of the first recording layer.