| 摘要 |
The present invention aims at providing an information recording and reproducing device which cannot only maintain interchangeability with the reproducing dedicated type media but also realize enhancement of reliability of media based on spare processing as appropriate. A spare area is selectively secured in accordance with whether or not an instruction indicating that a spare area is secured is detected. The instruction indicating that a spare area is secured, for example, is issued by utilizing a method in which a user directly selects whether or not data is recorded in a high reliability mode to set the selection results, or the like. When first recording processing is started, firstly, after an area for recording of a data block for first lead-in is secured in an unrecorded area, first user data is recorded from a position next thereto. When a reproducing defect is detected in verifying reproducing of recording data, a first spare area is secured in an outer periphery of a write once type disc and a spare processing object data block is recorded therein.
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