You can "finalise" a disk, whether DVD or CD, using nero. If you use multisession, you are saying that you will or may need/want to change what is on the disk. No multisession will automatically "finalise" the disk. A "Multisession" disk also can be "finalised". Just check the tick box that says something like "Stop further writing to disk" when you are about to "burn" the disk!!!!