| 摘要 |
A recording medium including segment information, and an apparatus and a method for forming, recording, and reproducing the same are provided to prevent an illegal access to user data and to perform more efficiently the recording and reproducing of data. A header portion includes 4 bytes of "PAC_ID", 4 bytes of "unknown PAC rules", one byte of "entire disc flag", one byte of "the number of segments" and/or 8 bytes of the number 32 of "segment_0"-"segment_31". The "PAC_ID" provides a state and identification code of the present PAC(Physical Access Control). In case the present "PAC_ID" includes "FF FF FF FF" bits, although the present PAC area is used before, the "PAC_ID" represents that the present PAC area is usable again.
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