I'm looking at getting my first Mac Pro. Probably the original 1,1. The one I'm looking at only has an 80gb hdd. I have larger drives but they're 2.5". I know there's adapters to go from 3.5 to 2.5 for the sled but my question is this, Can I use the 2.5 drive without an adapter or anything extra? I've done it in a power mac G5 before but this will be the first Mac Pro I've ever worked with.