Just a warning to anyone else with the Apple RAID Card and the Seagate drives with defective firmware: BACK UP EVERYTHING Once the firmware for the drives are updated (using a PC and the Seagate boot disk) the RAID Array is NO LONGER VALID. The problem is that the drive model number, serial number and firmware version are all used to identify the drives. Once any one of those items change, the Apple RAID Card gets VERY confused and no longer sees the drives as an Array. The first thing that happened to me was that the Mac Pro would simply keep rebooting and never even let me select an alternate drive to boot from. After a PRAM reset, the Mac Pro would just sit at the gray screen. I was able to pull each of the four 500GB Seagate ES.2 drives and boot from a 10.5.6 Install DVD. After finally getting into the RAID Utility, I attached each drive one at a time and watched as they appeared in the Utility. Each drive was listed as "Roaming", no matter which bay they were in. They all passed SMART, but with all four in, they were all "part of another array". I was finally forced to create a new array and a new logical volume. At this point I think that Apple's policy of dumbing everything down and WAY over simplifying the RAID Utility is crap. Any other RAID card and utility would have been able to recover from this. On the bright side, Time Machine works great and I'm very happy that my ReadyNAS supports it now.