I have a seagte 1tb external hard drive, I recently lent it to a friend, when he returned it the external made my pc very slow and did not pop up in my computer. This got so bad that it eventually freezed my pc. Now the external is not recognised at all, tried device manager options nothing it cant even populate, it doesnt appear under disk management so cant partition ect. iv heard the only option would be to formate the external however I do not know how to go about doing this as the device is not visible/recognised? Any one that can help me? will i then be able to recovery the data afta the formate?