Hi, I'm buying a new mac pro and am trying to figure out the the configuration of Hard drives. All these options are in addition to the already existing internal drive which I would leave as is. I would like 2 internal 1 TB hard drives and 2 external 1 TB hard drives. With the 2 internals set up as RAID 0 and the externals a RAID 1 (mirror) of the internals. Will this work? An alternative option: 3 Int 1TB HDs and 1 ext 1 TB HD. Can I get this set up as a RAID 0+1? With 2 internals RAID 0 and one internal and one external mirroring in RAID 1 the first two internals? Also, this will all be software RAID. Is that a safe, reliable option? Hardware RAID seems so expensive. Many thanks.