DiskDigger gives a significant result; it recovered many files from my computer that are deleted years back. DiskDigger is a tiny application (605Kb) that can recover files from any type of media that your computer can read. This includes USB flash drives, memory cards (SD, CompactFlash, Memory Stick, etc), and of course your hard drive. The types of files that it recovers include photos, videos, music, documents, and other formats.
The program doesn’t require installation, just unzip and run. Select a drive (one of the main demerits of this program is that there is no option to select an individual partition, so it takes longer time to scan the entire disk), select a file type e.g. JPEG, PNG, PDF Doc, MP3, etc and click next to scan and save.[via]