Please eject and reload it, if still fails, please exit CloneDVD, then play the DVD disc with source DVD Driver, if success, stop playing and exit the DVD player, relaunch CloneDVD, and try again.
If still failed, Please do steps below:
• Did you check the surface of the disc? Try to play it on your computer.
• Do you have the latest firmware for your DVD Driver?
• Did you turn off other burning applications or dvd player applications which might access the DVD driver at the same time?
• Try it again on another DVD driver or another computer.