Mobo - ASUS Rampage II Extreme
OS - Win 7 64Bit
HD's – Crucial 128GB C300 (Boot Drive)
Western Digital 2TB Caviar Green (data drive)
(2) Western Digital 640GB Caviar Black’s – RAID-0 (currently not hooked up)
Sorry, only one raid setup per motherboard. My suggestion is to delete all the downloaded movies and games you're not using, and set you install directory to the larger hard drive, leaving the smaller one(s) dedicated to your OS.