Similar to file deletion, when a drive or partition is formatted, the files are still present on the disk: they are just not shown. Hence, to recover files from a deleted partition, you will need to use specialized software for non-accessible file recovery.
The best utility we recommend to use for this case is Active Undelete. Although the utility is not free, it does give you a free demo to verify if your files are recoverable and it does work very well.
Simply open Active Undelete and click on 'Data Recovery Wizards' and then choose 'Recover files from a deleted partition'.
Note: Recovery takes between 1 to 5 hours depends on your drive size and number of files to recover. Yes, we've actually tried it!