A few minutes ago my HDD disappeared from Windows Explorer. It is a WD 1TB Black HDD that is a few months old. After restart it reappeared. After reboot, I checked event viewer and there were some errors. It said disk disappeared from the network without first being prepared for removal. I'm worried by HDD may be dying. Has anyone else had this problem before? My HDD with the OS hasn't disconnected so I don't think it's a motherboard issue. I'm running a virus scan to see if I have any problems. Hopefully it won't stress the HDD too much. Also, I checked the SMART status with SpeedFAN and the drive appears to being doing well. Help Please!