Patent ID: 8385176

Claim:
A read-only optical disc comprising a pit row including embossed pits and lands with which information is recorded, wherein, regarding recording data in a data format in which error correction blocks with n rows and m columns including at least main data, an error detection code, and an error correction parity are formed, in a certain error correction block, the pit row is formed based on the recording data in which an allocated location of additional supplementary information is set in a location in the same column as an allocated location of the error detection code as a location within the error correction block, in an area in which the pit row is not formed, additional information including at least the additional supplementary information and the error detection code and the error correction parity, which need to be recorded according to the recording of the additional supplementary information, is recorded with an additional recording mark row including additional recording marks and lands, and in addition, with the additional recording mark row and the pit row, command information for instructing a reproduction device to read the additional supplementary information recorded with the additional recording mark row is recorded.