Have you rewritten the original data on this drive?
You should never put anything new on this drive to rewrite the original data, for the rewritten data can be gone forever.
Therefore, to recover your data, you are supposed to try a formatted drive recovery freeware: http://www.squidoo.com/file-recovery-after-formatting
Honestly, this free application has restored my pictures, videos, music and other files from a mistakenly formatted drive. It is super easy and efficient. Go try it! Pay attention:
1. Stop writing anything new on the drive right now.
2. Save your recovered data on a different drive in case of recovery failure.
3. Back up your important data regularly in the future.