Not only can it, but it already has. Plus just today I talked with someone who had their electronic motel key erased and they could't get in their room.
We've been a tech for many years and tried to add a 1TB drive to our mini and while we DID get it to fit and we were able to completely reassemble the mini, the mini would not boot up. It's a shame because it probably only needs another 2 mm of space to make it work. I am now using a 750 Gb drive and waiting for a 9.5 1TB drive to come to market.