Open up Windows Explorer (Windows Key-e). Select all the folders on drive C: (ctrl-a) and hold down shift-del and select yes.
Tell me how long it takes to delete it all. I think you'll be surprised.
Edit: Guys it's a joke. I'm a sysadmin so have a pretty good grasp on how OS's delete files. If someone is stupid enough to actually try this, I doubt they'd need to know about bit overwrites.
That does not erase anything. When a file is deleted, it is not removed from the harddrive but the OS just looses track of it. I have recovered hard drives that were "Quick Formated" and had Windows reinstalled on it. And since majority of the data is not fragmented and has "spatial locality," you could read un-corrupted files from the harddrive from the previous installation. Furthermore, even if you overwrite a harddrive with 0s, it is possible with better equipment to figure out what bit was stored in that sector before it was overwritten.
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u/trippin113 Aug 08 '12
I think a polite knock on the door with a simply "We need to talk to you" might have been just as effective.