Using DAEMON Tools Lite v4.47.1 (with SPTD 1.83) with Win7.

Creating backup images (MDX) of music CD's that accompany sheet music books for the guitar.

I have backed up some 5 discs already. Now suddenly stumped on why DTLite hangs when trying to backup Complete Giuliani Studies disks one and two, which work perfectly, are clean and in pristine condition.

What could the problem be?