Hello, I have two WD HDD. The first HDD is 2GB and I boot from it. The second HDD I store all my downloads on. When I have my computer on for over 15 minuets, the second HDD disappears, even diskpart can't find it. When I do a reboot, and the BIOS sees both HDD, loads Windows 7 Ultimate SP1 32 bit, the same thing happens. Then when I boot in safe mode, the second HDD doesn't disappears. How can I check to see if it's a virus, malware, etc, and which program would be the best to find this error. I would appreciate any and all feedback with this issue. Thank You.