Did you have "Burn Proof" on? If you weren't using the wizard, it can be turned off I think.
Anyway, I've had a coaster or two with my Plextor 12/10/32a out of like 65...but one was that my computer was about to crash anyway and the other I don't remember what happened...I think I tried running a really memory intense program at the same time- usually, I just go get something to eat or go to the bathroom for those 6 minutes.
One coaster is not the end of the world...it happens to the best of us!