Patent ID: 8125868

Claim:
An optical disc reproducing method of detecting identification data from data read out from an optical disc formed of a basal plate made of synthetic resin that has a concavo-convex pattern formed in advance on one surface thereof based on data, and a reflective coat made of metal that is formed over the concavo-convex pattern on the basal plate, and identification data is recorded by irradiating an optical beam to the reflective coat to physically change the concavo-convex pattern, the method comprising the steps of: attempting to detect the identification data; and suspending a playback operation for the optical disc when the identification data cannot be detected in said step of attempting to detect, wherein the identification data is recorded in an area of the disc that immediately follows a digital content recording area, as one considers the disc's recorded material along a radius proceeding from the disc's center outward, and the area in which the identification data is recorded is located at almost the central part of a lead-out area, wherein the identification data is recorded between recording tracks of the disc.