I would be willing to bet that I could find plenty of stuff that you wouldn't want to be found even after using a restore CD
, or fdisk, or "long format", etc.
format c: off a boot floppy just doesn't cut it.
My suggestion, go here:
DOD compliant... it takes a while, but 3 passes, and the best of the best would be hard pressed to get a couple of useful bytes off the thing.
Wipe the drive using sdelete, *then* do the restore, and you'll be pretty much good to go, based on my own testing.
You'd be amazed at the stuff that you can get off of an "fdisk formatted reinstalled" drive, even with cheap-o, off the shelf software.
The stuff that I generally use is a little bit more expensive, but we're talking data recovery off of drives suffering from moderate hardware failure.
(I've done this for law-enforcement in legal cases, so I'm not just bullshitting you.)
Short of that, a really strong electromagnet followed by a bit of time on a 5-ton press followed by incineration will get you the results that you want.
We can agree to disagree.