Hello, I have a mac pro from 2006, and it has hard drives in all four bays. The first drive is the 250gb default drive from Apple. The rest are Seagate and Samsung. The setup is: 250 (Mac) / 320 (Empty) / 750 (Backup) / 1000 (Media) The 250gb is getting full every once in a while, and I might wish to replace it with another 1000 or even the new seagate 1.5TB one. Whatever .. but since it only has the OS + Program files and some stuff in /home, I want to use the bigger drives for the data. And use the 320gb as the boot drive. So, what I want: Move (clone) the 250gb to the 320gb Reboot and boot from the 320gb, replacing the 250gb. Which I can then make empty and use until I replace it with a 1000gb drive. I can use CCC to clone the 250gb to the 320gb. But is that enough? How can I then reboot and have the 320gb as if it was the 250gb, ... And how can I be certain it is booting from the cloned 320gb, or the original 250gb once I am back into OSX? And can I then repartition the 250gb and still reboot, or will this ruin the master boot record or boot menu setup, etc? I have no experience with this (yet). And am afraid to end up with a non booting system and a long night of trying to restore using the retail disk for leopard. I hope I am making sense. I just want to move my boot to the 320, and get more space for my boot hd. And have everything be the same.