TestDisk is a powerful free data recovery software.
It was primarily designed to help recover lost partitions and/or make non-booting disks bootable again when these symptoms are caused by faulty software, certain types of viruses or human error (such as accidentally deleting your Partition Table).
TestDisk & PhotoRec 6.9 comes with numerous improvements, EFI GUID Partition Table is now supported. EFI GPT is used mainly on Itanium, MacBook and Mac Pro,
Both utilities can use sudo if the user is not root, this functionnality will be enable for MacOSX at least so users won't have to go in command line.
Under Linux, disk model is now displayed to help identify the media.
Internal card readers are now better supported under Windows.
Read more here.