Apparently the mid-2011 Mac Minis can fit a second hard drive, internally, with a special cable. Do you know what size drive it can fit, i.e. do I need to use a 2.5" laptop HDD or can it fit a ...

I asked at the Apple Store about this, but they have told me wrong info in the past, so I'm doubling checking here. I bought a Mac Mini 2011 two days ago, and I'm already itching to upgrade. I'd like ...