I'd factory reset then smash the drive. Easiest way is to take the hard drive out. That would take the "brains" out and all your information. and get rid of the rest of it. Yes you would have hard drives sitting around but you'd still have all the information and no one could get it. That's what I would do if not for H. If you want to get rid of the drive all you really have to smash is the main board of the hard drive. You can drill 2 holes through the drives.

But my h would use software to DOD wipe the computer 3+ times so he could used the hard drive later.