I don't have my mac pro yet, and I know I could always wait until I get it...but my curiosity has gotten the better of me. When you have two Super Drives, and you press the little eject button on your keyboard, which slot opens? Does it prompt you? Does it always open the same one? Is there some special other way to open the bottom slot? I know it's a silly question, but I don't think it's a dumb one. Thanks guys and girls!