What is the hard disk like inside these? Could I take the hard drive out of the enclosure and put it inside my Mac Pro? I have a friend who's WD Elements drive won't show up when she plugs it in, but I haven't seen it or messed with it first hand yet, so I don't know exactly what's going on. She says the light shows up and then goes away, and nothing else happens. If I fail to make it work through conventional means, how do I connect the drive to my Mac Pro in a way that bypasses the drives own AC Power system, which could be the faulty component?