Thanks it does the trick, but why,i backup tons of files in other software, and never have i to formate a dvd, in the old days when i used floppydisk its was normal to do this but in the year 2011? lol
Formatting is only required once. The advantage of formatting the media is that it can be re-written and files can be added and erased like a regular disk. This can't be done if the media is 'mastered'.