A:Answer Unfortunately nobody can answer this question without seeing what happened when it happened and without knowing LOTS more about the situation (software, etc) You can try a file recovery tool, but for that to work the sectors would need to have been untouched. If they were overwritten with new data, then your old data is unrecoverable.
Remember, when you delete a document off of an external drive it DOES NOT go to the recycle bin. It permanently deletes it.