|A lot of the time the control board that converts the Sata interface to a USB interface fails and therefore does not allow the device to be recognized. |
What I tend to do in this case is
Open the case
remove the hard drive
use a hard drive docking station to connect the drive to my pc
this is just an example, there are plenty to choose from
if the drive is making noises such as clicking or knocking then the problem could be the disk itself.
If you do not want to buy a docking station you could also install the drive itself into your pc, if you know how to...