Your DVD burning software will have an option to finalise the DVD when you burn on to it.
Finalising means that after the data is recorded on to the disk, the DVD is closed or finalised. (You won't notice any difference.) You can't add any more files or data to a disk which has been finalised. If you haven't finalised a disk you can burn more files on to it at a later date. Some DVD drives in players/recorders can't play disks which haven't been finalised.
Pete
September 2007