Ken, Fred, thank you both for your help ! - Ken : I read the posts you gave me the links. Yes, I will pay attention to the space disk. To make this film on one disk, I am now sure I need an other software for burning action. - Fred, I think you gave me the solution. I could not try because I do not posses yet this Nero software. Before I purchase this software, I would like to be sure I well understood the actions to do. So please, could you confirm to me Fred it is this, with this example : - We've got 2 pte files : A.pte and B.pte. - 1). I open A.pte, run bideobuilder and choose dvd actions. I create the A.ISO file on the hard disk. (I can also save that project as A.ptv, ... but it is not necessary.) - 2). I can do the same another day with B.pte. - other pte files)... - END). With Nero dvd burning, I select A.ISO and B.ISO, to burn 1 dvd. In Nero, I can add a menu presenting A and B. Nero makes itself all the VOB, IFO and BUP files. Did I well understand ? The 1), 2), ... n) actions can take lots of time. But realized separately, use the same space disk for temp files. The final action of burning in Nero is not so long, because the files are already encoded. If it is correct, you exactly answered to my need !! Thank's Techman-Fred ! Regards to you both. Casp