| 摘要 |
An optical disk apparatus according to the present invention includes: a sub-data forming section for forming, from data to be recorded into an optical disk (3), element data (42a, 42b) constituting the data and parity data (42c) for reconstructing the data in a case where the element data (42a, 42b) becomes unreadable; and a recording position determining section for determining respective recording positions for the element data (42a, 42b) and the parity data (42c). The recording position determining section determines the respective recording positions for the element data (42a, 42b) and the parity data (42c) such that they do not overlap each other in a projection plane of the optical disk viewed in a light-irradiation direction. The arrangement makes it possible to improve reliability of data reconstruction in a case where data loss occurs in data recorded in the optical disk (3) in which data is recordable in a plurality of layers.
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