OPTICAL DISK SYSTEM DEVICE

PROBLEM TO BE SOLVED: To provide an optical disk system device for continuously recording plural packets on an optical disk at once and to increase the number of direct- read-after-write times and also to shorten a recording processing time. SOLUTION: At the time of transferring plural user data stored in a buffer memory part 82 in a host system device 12 to a buffer memory part 85 in a drive system device 15 after calculating an optimum recording power value by an optimum recording power value calculating means 87, by a recording instruction from a control part 81, the continuity of the individual user data is confirmed by a data discriminating means 13, and afterward, packet boundary information is generated to be inserted into between the individual user data by a packet boundary information generating means 14. At the time of storing the individual user data in the buffer memory part 85, a joint data generated by a block generating means 16 for linkage in accordance with each individual packet boundary information is inserted by a data inserting means 17 to form in a packet mode of data. These individual packets are continuously recorded by a disk recording means 89.