I would try several desperation actions that I have had work before. I had a drive failing in a laptop and just turned it on its side and tapped the drive area slightly while booting. It worked long enough to get the data off of it. I also had someone say that their drive was failing, It was plugged directly to the laptop. It would not boot up. I unplugged the external and the laptop booted. I tried the external with a powered USB hub and it worked fine. I have also cooled a drive down in a refrigerator for a while and It worked long enough to be seen by the pc and removed some of the files on it. I have also used a program that had a free download, I can't remember what it was but it allowed you to copy like two folders at a time unless you purchaesed it. It allowed me to see some of the data on the drive. Good luck