Reviewers Recommend Anal Slut Search - review by Captain Jack Director: Mark Wood, Francesca Le Starring: Mark Wood, Dakota Marr, Magenta Lexx, Char Gates, Violet Dawn. Read review
If you delete files on your hard drive, clear history, empty recycle bin, clear cookies, and internet files--where do things hide? They recommend software like Erase before you discard a computer as even reformatting hard drive does not delete info.
if you're doing something that requires you to wipe your hard drive for fear of forensic recovery-save your cash on the software if you're going to toss it. take it out of the case and OJ the fuck out of it with a hammer or pickaxe.
Are you "discarding" (i.e. throwing the computer away) OR planning to give it away to someone else?
If you're throwing it away, why not simply remove the hard drive(s) and be done with it?
If you are, in fact, giving it away and piece of mind is what you're after, there are programs that will completely erase a hard drive by overwriting ALL the data on the hard drive.
One such program is SecurErase which comes as part of the SystemSuite suite of utility programs from VCOM. This is a first-rate suite of utilities that is affordable and I highly recommend it! Best of all, you receive completely free virus definition updates (so why pay Norton and the others monthly/yearly charges for updates?).
if you're planning to re-use the thing, you can usually find a 120-160gig drive on sale at staples or something for about the price of wiping the old one.
Overwriting all data is not enough to make the data unrecoverable. Last time I checked (which is some time ago, so there are probably technical improvements by now) data that was overwritten 7 times could be recovered by special forensic tools. It ain't cheap, but doable.
jacco's right about recovery being possible beyond what you'd expect and the cost of trying to prevent it. you can get a 250gig drive for around 100 bucks, and it'll be fresh and have a higher mtbf than one that's been used.
take the old one, grab something like a hatchet or a hammerdrill and fuck it up until the casing comes apart and the platters(they look like discs) are visible. make sure they don't resemble a disc when you get through with them.
truth is, if someone digs deep enough on a working drive with functional platters, they'll find some data. storage is cheap.
Physical destruction is the way to go. I think the military instructions for destroying data on a harddisk end with something like bulldozing the disk and pouring it in concrete. And with the current price of harddisks, chances are that one of those 'eraser' programs is just as expensive as a new drive, so take james' advice, buy a new disk.