What are my options for replacing the internal hard drive on a 2008 Mac Pro. A1186 EMC 2113 Quad core 2 x duo, 266Ghz. It would be nice to get a new drive rather than a used one. As far as I can tell it should be SATA II or III also OK. And it should be 3.5". I think you can fit a 2.5" drive with a caddy, but these cost extra. Looking for an economical option that's reliable. I believe the drives are 500Gb ones - I suppose 1Tb would work, but wouldn't be any faster? Any 3.5" drives I should avoid as being incompatible? Also I'm in the UK in case anyone can recommend a supplier.