Optical recording medium recording and reproducing device.

摘要

A recording and reproducing device providing control data recording area on erasable type optical recording medium wherein control data are recorded thereof, characterized in that there are provided control data recording area forming means for forming control data recording area comprising more than two control recording blocks where more than one record unit are composed and said control data can be recorded independently, and control data updating means for recording a new control data in the control data recording blocks excepting the one where the control data just prior to updating was recorded, when updating the control data in said control data recording area. Even though device electric power supply may unexpectedly fail, this device is structured to minimize damage caused by such a failure.