Windows Vista Vista vs Divx

Hey,
perhaps it will sound stupid what I am going to ask now... .
Is it true that in Vista if the OS sees a copied DVD on the HD, it will make the HD unaccessible?
I have bought over the last years quite a few DVDs and am keeping them on my HD as a backup in case the originals get damaged.
As i said, perhaps its a lot of b-sh.t what i am saying, but better safe then sorry, right?
Hoping to hear something.
Thanks.
vr6ch