try using the "disc quality" option, and scan the disc again. Your drive had problems reading the disc back, so that means there is a higher error rate. If you want a high quality back-up then you will have to choose a slower burn speed.
ASUS 1608P2 >> Crossflashed to Pioneer 110 -> RAM+Bitsetting+removed riplock+RPC1
Boost Mobile stole my minutes, then would rather loose me as a customer than give back my minutes (thieves).