Option A. You have 500 gigs of free disk space that you want to completely wipe. You use your wiping program to wipe 500 gigs of unused disk space, which takes hours. (not to mention "wear and tear" on your hard disk....) Option B. Can you create a large 499 Gig AVI file so this leaves you with only 1 gig of free disk space. You run the wiping program to wipe 1 gig of unused disk space which takes a minute or so. Then you "regular" delete the 499 Gig AVI file. Does Option B carry the same effectiveness as Option A? Or are you compromising the effectiveness of wiping by trying to take the shortcut?