I am using Ubuntu 9.04 and GnomeBaker 0.6.4
I copied a DVD to an iso file and then wanted to make a DVD from the iso.
GnomeBaker 0.6.4 wouldn't recognise the blank dvd media when I selected Burn DVD
I opened the file manager Nautilus 2.26.2 and it recognised the blank dvd+r media.
Once Nautilus 2.26.2 had detected the dvd GnomeBaker 0.6.4 also was able to burn the image to the disk.
So the end result is I can copy DVDs so thanks but the method is a bit odd.