After less than a year, the external hard drive I have been using to boot my MAC (the external is for recreation, the laptop itself is for my design work) gave out. The MAC doesn't even recognize when I plug in the external, so I'm fairly sure the hardware is shot.
Aside from some of my homebrew projects, I now cannot update my Ipod because all of my music and videos were on the external (the laptop's hard drive isn't big enough).