Honestly, I had a Sony digital camera that was received as a birthday gift. It had helped me recorded many important moments of the past twp years. Moreover, to avoid data loss, I had saved them all on the inner SD card, not the camera internal memory. However, last month, this camera was formatted mistakenly and all my photos stored on this SD card were gone.

So, to get my lost cameras photos back, I had done a Google Search and found many memory card data recovery software, like:
http://www.ucfix.com/data-recovery/data-recovery-after-format-memory-card.html
http://freeware-fix.blogspot.com/2013/03/memory-card-recovery.html
http://blog4mark.blogspot.com/2013/01/memory-card-recovery.html

Fortunately, after reading many related articles and threads, I had chosen a reliable data recovery program and rescued them all back with ease and success. Am I lucky?

If you also really have no luck to recover lost data, my experiences may also give you some clues.
So, I post this here and hope it can help you guys somehow.