My searches haven't turned up much. I have four drives, two 2 TB sata and two 3 TB sata. I'd like to mirror each set with RAID 1 I had no problem setting up the raid for the two 3 TB's but the 1st of the 2 TB set has the mac os on it. Can I clone the OS drive to an external and boot from it somehow? How do I get around this? Thanks!