If you've got a leftover copy of The Legend of Zelda* lying around -- and you don't mind gutting it -- then you can follow this simple guide on how to mount a 2.5" HDD into a NES cart to make the nerdiest external hard drive case possible without blue LEDs. What you'll need is: proprietary bit to open the cartridge, Dremel (recommended), drill, 2.5" HDD, USB HDD adapter, and some free time.