This is Joel's MDFS, with four boxes in total. The top box is a tape drive - which works, but I didn't get chance to see it in action - and hard disc, two further hard discs in the second box, the MDFS main unit itself and, at the bottom, a dual floppy drive box.
It was nice to see the floppy drives in the official SJ Research casing. It's not something I had seen before. I have to use external dual floppy drives with my MDFSes.