well i guess the problem is really about the dvd's quality, because ive 13 files to burn in 13 different dvd's.
So i started with the file one, and after 4 dvd's 3 didnt make it and got error so they now need to go to garbbage. the other has made it and saved correctly.
Now im on the file two and already got 7 errors= 7 dvd's to garbbage.
So i think the problem is really about the dvd quality, so ill buy some verbatim in a store close to me: 100 dvd's verbatim= 31,40