Internal we have two computers from 2004. One was built by a friend and runs Win 2K and the other I took from someone who was going to throw it away (power supply died). It's a Dell Dimension 2400 running XP. (The reviews of it are dated early 2004).
External a huge 80GB WD, purchased July 19, 2005. (I don't keep it attached to a computer all the time and it doesn't get used hard. I've actually archived all my floppies before I threw them out.