My externel hardrive (personel user

Question

my externel hardrive (personel user 300L8 suppose to have capasity 60 or 80 gb all what I have now 5.29 gb when I open it I dont see any files I tried to formate it but the result the same only 5,29 gb what happen and how I can restore it to the original capacity may be outside interferance or bugs in it please help my name is george razzouk my email [e-mail] thank you