So I've just installed two new HD's into bay 2 and bay 3 of my new mac pro and obviously want to start using them right away, but I'm totally new to Mac Pros and don't no how to format them! I've opened up Disk Utility but the only HD's showing is the one in Bay 1. Have I not inserted the new drives correctly? or am i just missing something really simple?!! Any response will be greatly appreciated. Many thanks.