Current Mac Mini's solder the cable to the drive and it's not swappable. (It's like the new iMac's drives -- which have apple specific firmware and thermal systems, but worse.)
I stand correct. My friend went to an Apple certified tech to get her laptop HD swapped with her Mac Mini HD, because they wanted more of their music on the laptop because they traveled often, and the Apple tech couldn't do it. Issue with the Mac Mini and how it makes the HD a non-user servicable part.