http://www.chrisfenton.com/cray-1-digital-archeology/
http://www.chrisfenton.com/cos-recovery/
I just wish he'd made higher resolution pictures.
He's also seriously hardcore (or maybe I feel out of depth because I'm a software guy):
> I built a robot that would manually move the head forward 1/5200th of an inch at a time (there are 400 data tracks per inch, so this gives me a whopping 13 steps per data track!), while a high-speed analog-to-digital converter would take the analog signal straight from the drive’s read amplifier and buffer it into an FPGA at a blistering 80 million samples-per-second (like I said earlier, the theme here was overkill…the data was only changing at ~10 MHz or so)
Related: http://www.modularcircuits.com/blog/articles/the-cray-files/