Quick erase - the disk will seem to be empry but the data will not be physically removed. Be careful using this option if there is some confidential information on the disk.
Full erase - all the data will be physically removed from the disk. It'll take some time.
Press "Erase"
CD-Rom will open when the process is over.
Note:
If your disk is not rewritable the programm will inform you by the message: