A quick format in a PC or in your camera does not actually sanitize the flash to its original factory format. Quick format clears the pointers for where the data for a specific picture or video clip is stored on your cards. Because of that, you can always recover the data with Prograde Digital's Recovery Pro software if you accidentally have done a quick format. Refreshing (sanitizing) a card does a deep level format of the memory cells and after that the data is never recoverable.