So I finally heard back from "Accusys" about how to install their PCI-e RAID card into my mac pro. Not exactly plug and play. The RAID controller I'm talking about is the Accusys 61000-4 RAID card. It was only about $300 at Newegg and according to their MacWorld display, is pretty phenomenal. In case any of you are pulling your hair out to get this to work, here is the solution: --------------------------------------- Since Apple has not yet been able to place our device driver into their Mac OS, there are a few tricks you will need to know before installing the Mac OS onto our RAID. Please follow these steps to enable our bootable feature. Things you will need: 1. Intel Mac Pro 2. A host OS disk drive that came with the Intel Mac Pro. 3. Accusys 61000 4 bay controller. 4. One to 4 Mini SAS cable which came with the Accusys 61000 packaging. 5. At least one and up to 4 disk drives depends on the RAID level you would use. 6. A power supply or any PC that can power up the hard drives. During the installation, you will need to power up the hard drive/s from that power supply or PC. Installation procedure: 1. Plug 61000 controller into the Mac Pro. Use our mini SAS cable to connect the disk drives you would like your OS to be installed to the controller. Do not reroute the iPath yet. 2. Use local host drive and boot up the system. The system should detect 61000.controoler. 3. Install the Mac OS driver and the GUI. Then update the SystemCode, Bootcode, EFI/, Mac OS Drivers to the latest version. Please make sure that you install the EFI and the latest Mac OS driver!! Restart the Mac Pro. <http://www.accusys.com.tw/eng/support_download.asp#expe> 4. Open up our RAIDGuard X Gui and you should be able to see the drives that are attached to the controller. Use the create RAID function to create the array volume. 5. Once the array volume got reported from OS, you can then use the Disk Utility function to restore/clone the Mac OS from the local drive onto this RAID array. Wait until it finishes, then shut down the Mac pro. 6. Remove the Local Host drive and replaced it with the Array drives that were attached to 61000 controller through mini SAS cable. Re-route the iPath and connect it to our controller (you might need to re-arrange disk slot 1 and 2 to make the cable long enough to reach our card). Then power up Mac Pro and the system should start to load Mac OS from Array. -------------------------------- Good luck!