I burned a movie from my HDD on DVD-R using my VISTA. i.e. i didnt use any burn-software. Just click burn on the file (I have VISTA home premuime). OK it work fine. Now, something strange happend. I wanted to burn another movie from my HDD. I forgot to put a new blank DVD-R disc. What happend is that VISTA format my prebiuse burned disc and burn on that the new movie!!!! How the hall it happened? My disc is DVD-R not DVD-RW!!!!