Any RAID Xperts out there? Friend has an Asus M4A89GTD-Pro and set up Raid 1 with 2 WD500 Gb's. Recently something went weird and it started to show Raid Array "Critical". Ctrl+F during the bootup is the normal way to get into check the assignments and to find which drive has failed. Ctrl+F would not allow me to enter ! Try the old way by disconnecting one drive and try the bootup. Then the other. BOTH will boot up to Win 7, and the data looks good, apps work , etc. The WD HDD analyzing software shows both drives are okay. no bad sectors, etc. Swapped Sata cables and switched which drive is logical drive 1 or 2, and still no difference. After some beating on it today, was finally able to get Crtl+F to allow me into the Raid setup. It is set for Raid in Bios. It is set for Raid 1 in the assignment, but one of the drives is showing as a "single drive" and I can't reassign it to Raid1...? I'm wondering if the Raid assignment program has gone buggy, or the mobo Sata 1 & 2 ports are bad. That's the one thing I didn't try was swapping Sata port assignments. Normally putting a new drive into one of the slots would start a crosswrite to the new disc, but that doesn't happen either. It seems to believe it has a bad drive in the array but can't tell which one ! I know the data on the HDD's is good, although maybe out of Sync by now. Also tried the RAID XPert download from AMD/ATI, but it wasn't much help. Any body have knowledge of this or suggestions !! If worse comes to worse, I guess I could clone one of the drives data, delete the arrays and add 2 clean drives, rebuild the arrays and load the cloned OS to a new Raid array. Any help would be much appreciated.