2 problems - solved

 Paul said:
> Finally, you can use the Windows interface to assign a drive letter.
> Right-click the partition needing a drive letter, in diskmgmt.msc.
> There should be a "change drive letter..." in there.
* Nope. No drive letter and no way to assign a drive letter.

> You could try TestDisk, to see if it has files on it, but
> I don't know if TestDisk processes USB sticks. It might just
> ignore a USB stick.
* Worked like a charm.
  Basically, the partition sector was gone and had to be re-written.