CloneDVD Perfect Backups

[Ilmater]

I'm just using CloneDVD to make copies on my hard drive of my DVDs that I can view at home. When I play them back, they look like they might have a SLIGHT degradation in quality. I'm using the DVD-R/W DL quality selection, so the slider always says 100%.

Is there anything else I can do to make sure it is making 100% exact copies of the files?

Thanks for any help you can give me.