Optical recording medium, information processing device using the recording medium, and data recording method

An information processing apparatus adapted for performing recording or reproduction of information with respect to an optical recording medium in which a write-once or rewrite operation of data can be performed with a block including a group of data as a unit,

• the information processing apparatus including data recording means for generating recording channel data in which buffer areas having a fixed length for random access are added before and after respective blocks to record the data onto an optical recording medium,
• wherein when recording of a new block is started with respect to a first block that has been already recorded, a start point for the fixed length buffer area before the new block is not fixed relative to the first block preceding the new block, and the new block is recorded in a state that the fixed length buffer area disposed immediately before the new block and the fixed length buffer area provided with respect to the new block overlap with each other, and when recording of the new block is completed, the new block is recorded in a state that the fixed length buffer area disposed immediately after the new block and the fixed length buffer area disposed immediately before a next block adjacent to the new block overlap with each other,
• and further comprising data reproducing means for reproducing plural synchronization patterns recorded at a preamble for signal processing of the fixed length buffer area disposed immediately before a respective of the blocks to establish synchronization.