Any idea how to recover corrupted my passport?

well, it a bad news for me. an hour ago i bring my external hard disc to some technician & he said that my passport is corrupted. he said that he cant format or open the external. so guys,  here i realy2 need some help.i just need to know how to save the data that still inside in my external hard disc? all my files & all important thing are inside there. so, please help me with this. i dont care if my external cant be use anymore, but at least i still can save my stuff. please & pretty please…help me…

If you are able to see the partition, you can use Photorec or Recuva those are free applications. However if you are not able to see the partition, then you will need professional assistance.