I have a 2TB Seagate hard drive that keeps dropping out in Windows 7. I use it as my main backup drive and when writing to it using either of the two backup apps I use the drive usually "disconnects" and I have to switch it off and on again to use it. I've tried using a different USB port and a different USB cable - same thing. I have run Windows 7 error-checking checking which reports no errors. When it disconnects, device manager shows that it is still connected and working but it definitely doesn't work. For instance, I can double click and open it but it shows no folders. Switching it off and then on fixes this but only temporarily. This problem started about a month ago and seems to be getting worse over time. To me it sounds like a drive problem but I'm not sure how to diagnose it. Your assistance would be appreciated.