An ID information, user data, and a control information are disposed each in one block, and coded for error correction. The user data and control information are disposed in an ECC block 1, while the ID information is disposed in an ECC block 2. The ECC blocks 1 and 2 are coded separately for error correction. The blocks thus coded for error correction are disposed in one physical structure, data is modulated, a sync signal is added to the modulated data, and then the data is written to an optical disc having the above data format.