xbox 360 premium and xbox 360
What is the difference between an xbox 360 premium and xbox 360 arcade? I am going to get an xbox 360 arcade included with some furniture from roomstogo and I'm wondering what the difference between that and an xbox 360 premium is. I heard that the only thing was the hard drive. If that is the case then could I just buy a hard drive and it would be the same thing as a premium? And also if I did that, could I use xbox LIVE?