I am running Win 7 with two Seagate 1tb drives in Raid 1. Has been working well for almost a year. I loaded Battlefield 3 onto my system and started playing it. After playing for a few hours, it locked the computer. (screen went black and nothing would happen). As I rebooted, I noticed message that " a disk in your array has failed or is not responding" popped up briefly. I tried to look through the AMD utility that comes up during booting, but must admit I'm in over my head. This is my first Raid system, and I know enough to just get myself into trouble. I'm guessing one of the HD has gone bad. I tried to run Seagate's Seatools to check the drives, but it would not run on the Raid drives. I alternately unplugged each HD and rebooted. Each would reboot to Win7 and even play Battlefield 3 (for short periods before locking up or going to BSOD). Have I made the right assumption? Could I be on the wrong track here? Could it be something with the MOBO or with my 6800 HD video card? Any help is much appreciated.