There is a compatibility problem between the CD and the burner. I have done experiments. DVD discs are newsmy and RW+, and this kind of fault will occur in both models using pioneer burner. The disc remained unchanged, and the recorder was replaced by ASUS 20 1, and two consecutive discs were successfully completed. Regardless of the selection speed. Mainly because there are many disc manufacturers now, the compatibility problem comes out. When buying discs, try to choose brands that have been used before.