I built the system-Asus Sabertooth X79, Corsair Veng 32 BG Ram, MSI GeForce Gt 670 GPU Samsung SSD 830 256 GB, and 3 TB Seagate Data Drive. I also have a DVD Optical Drive and BD burner. I installed Win & Professional. Everything is working beautifully. I decided to add another 3 TB Western Digital to make a Raid 1 set up. When I leave the bios in ACHI mode, I can seel all my drives( SSD, 2 3TB Data Drives and 2 Optical). When I change the Bios Sata to Raid, I see only my SSD(Boot Drive) and one 3TB Data Drive. I am missing the ODDs and the other 3 TB Drive. I am unable to enter IRST mode by pressing Control <I>. What is going? I am at a loss. When I change the bios everything reappears. Help??