CD lasers and the DVD lasers are different. The light
from a DVD laser has a wavelength of 640 nanometers where the light from a
CD laser is 780 nanometers. The smaller DVD laser wavelength allows it to
focus on the smaller pits in the DVD disk. Thus, accounting for the
increase in storage capacity.
It is entirely possible that elfi`s dvd drive is bad on the dvd burning side.
Actually, IIRC, CD-RW uses DVD wavelength(There's a long simple text on harman/kardon's website telling why some DVD players only read CDRW as CD formats)
But I don't know if players reading CD & CDRW have different lasers.
well when i want to burn it tells me that the dvd is full, but when i put in a dvd film or just an datadvd in it it reads it fine
Just when you click on the burn icon of Nero 7 it just spit it out telling me it full or not writable
Sometimes, with Nero, I have similar problems. I don't remember if the trick is to insert the disc before you start a new project or if you have to insert it only when it's asking to. You could try with "CDBurner XP Pro" also.