|It may be the external gizmo you are using and not the drive. |
I'd start with booting to a live linux cd and see if you can access the drive. Use maybe ultimate boot cd and use some of the hard drive tests or consider getting samsung's hard drive diagnostics.
Best would be to try to connect it to some other known working computer or external connector. Then see if you can access it.
Testdisk or photorec may be able to get it or maybe unstoppable copier or other tools but you have to be able to access to some degree first.
Why did it take me over a year to phone in a problem to ATT?