That's absolutely correct, however, there's a bit of a problem with the "play it" advice. Just because a disc is playable does NOT mean that it's not defective. How is this possible? Because playing it doesn't necessarily hit all the areas of the disc that a backup would. I have a "Bad Disc?" guide that I recommend people use. The gist of it is this:
-Temporarily disable AnyDVD HD
-Insert your troubled disc
-Load up the latest version of ImgBurn
-Use the read image function of ImgBurn and ignore the copy protected disc warning. It will still create an image
If ImgBurn can create an image with AnyDVD disabled, but can't with AnyDVD enabled, then there's a possible issue with AnyDVD that Slysoft will need to look into. However, if ImgBurn fails to read the disc with AnyDVD disabled, then either the disc is bad (scratched, poorly mfg'd, whatever) or it could signify a possible drive failure. Most of the time it indicates a bad disc. But there are times when we've seen drives fail and the symptoms are pretty much the same. If it's happening with multiple discs, then you have to start suspecting the drive. Another possible cause is conflicting drivers. Packet writing software is known to cause issues at times. So, it's a complicated issue to troubleshoot, but, I always follow Henry David Thorough's advice...."simplify simplify simplify." Meaning, take as many variables out of the equation as possible to get to the heart of a problem.
I hope this guide helps!