Maybe try PhotoRec first:
PhotoRec is a companion program to TestDisk, also included in this Hive Five.
Like TestDisk, this app is also devoid of a GUI, but likewise is quite
powerful at file recovery. We're including PhotoRec independently of TestDisk
because many users distinctly prefer PhotoRec as a safer alternative when
deep disk recovery isn't necessary. This recovery tool won't mess with your
partitions or help you rebuild your master boot record; it will, however,
dive into your disks in a safe, read-only mode and ignore partitions and file
systems in an effort to seek out your missing files. PhotoRec focuses on file
types, is operating-system agnostic, and despite its name, isn't relegated to
just photos. Overall, PhotoRec is a powerful tool for quickly and safely
copying your deleted files to another disk.
http://lifehacker.com/5237503/five-best-free-data-recovery-tools
