I tried the BTC1008im at another pc. This was a clean pc without any burning programs. Installed Nero, and it still couldnÂ´t read/ write.
So today i went down to get my money back, and bought a NEC 8x dvd. And it works ! So apperently ther is a weeknes in the BTC drive- just to let you know: get your money back and get another DVD !!