Virtual CloneDrive Question

I for some reason am getting an error when mounting a dvd with the .mds file using Daemon Tools. I’ve never had this problem before so I decided to try something else. i just downloaded clone virtualdrive and it seems like mounting with the .mds file isn’t even an option. it works by clicking on the .iso file, but i thought the .mds file had the dual layer break info. won’t the dvd get screwed up somehow if i mount it with the .iso file and make a backup with clonedvd? i don’t have time to watch my backup any time soon so it would be great if someone could help me out. thanks.

never mind. i realize it does mount the .mds with a different dvd i have on my pc. the problem somehow lies with the other dvd i ripped to my hard drive. i just can’t mount it with anything for some reason.