Plus Corporation "Hard Card"

Hard drive on a stick!  (Well, actually on an ISA bus card.)  They were great for wedging a hard drive into a system with no hard drive bays.  Available in 20, 40, and 80MB, and more.  Tech-support tip: if a hardcard won't spin up, pull the card out of the PC, grasp it tightly, and whack the drive end firmly on the sole of your shoe.   Replace the drive, and start the system as usual.  This procedure is called "booting".  (If you're wearing loafers, it is referred to as "shoeing".)