I have just upgraded my backup system by replacing two 1tb WD drives with two 2tb's. This gives me 3, usb 3.0 external WD 2tb's, which I sync/backup using syncback. These drives are not running at usb 3, as I can't seem to be able to make the system do this? I am ok with usb 2. I was able to add all of my files to the new drives, filling them to 50% capacity. But, one of the new drives is not seen by windows 7 "my computer" on the first startup. If I restart, the drive will show up but sometimes it's folders show as empty and the drive is half full! If I restart again, all the files are finally seen and I can work with them! To solve the problem, I tried using another usb port with no success. I have changed the drive letter from E to M and this seems to make a little difference, not requiring two restarts (usually). I have looked at the boot order but can't really make sense of it, as I can't id the problem drive. I googled the problem and one suggestion is to uninstall all of my usb drivers and start over! UCK!! HELP!!!