It apparently threw a tantrum over how hot it got in my room and refused to work. After a while of trying to get my dear data off it (after installing osx on a firewire disk and booting that, of course), the mini wouldn't even recognise it anymore. I then decided to let the entire thing cool off for half an hour. This made it work again to at least the point where I could make a disk image of it. I didn't trust it anymore though, so I opted to just go out and get a new drive. So now my Mac mini is fitted with a Western Digital Scorpio 80G drive instead of the usual Toshiba 80G. It's a little faster, too.