Is it just me??

I've gotten vined Phish discs from 2 different folks, and in both cases, both discs are giving me CRC errors, and I can't copy the files to my harddrive to burn them.
In the first case, the discs had a wierd directory structure, so I couldn't even try to play them to check if they were OK. In the second case, they are standard,proper DVDs, with video_ts folders, and tho' I haven't played all the way through them, I've spot checked them here and there, and they seem alright.

I've copied way over a hundred DVDs from other places,(and run into my share of scratched discs from Netflix, etc, that just couldn't be ripped) and burned tons of them that I've downloaded here and elsewhere, but these are giving me hell.

I'm sure it's possible that there are problems with the discs themselves, but otherwise, any idea what could I be doing wrong??