I have WD 1.0TB SATA hard drive and 150GB Hard Drive both of them are installed with window 7. Recently I got an error that my primary 1.0TB HD is not showing up in my computer. I tried Advance Mode of the BIOS setup program - Tool - ASUS EZ Flash 2 Utility - H61MLX3R2.CAP and restart the Bios. The HD is detected in the begginning but it will get lost in the middle of Window opening. Why is it not showing up on my computer to be used?