Transfering data from a 20GB hardrive to a 60Gb. I plug the 20gb hardrive on top of the 360 then I use the data cable to connect the hardrive to the rear usb port of the console I put the CD in and press "A" then it comes up with the picture of the console and it wont allow me to press "A" to go onto the next step but the "B" button is enabled as if it cant pick the hardrive up. Pm me with help please...