This kind of problem is called "
Format Error" and often happens to memory card or USB flash.
There are many reasons may lead to this. Like pull out the card without power off or fall the memory card onto the ground, even simply the card becomes corrupted.
The
solution is DO NOT format the card right away, Rescue the pictures or movies insides first.
Do it as follows --------------------------------
First things first: DO NOT take any more photos with the memory card that you want to recover photos from in case you may quite possibly ruin your chances of recovery.
Then Connect the card to your computer as it should appear as a "Removable Drive" or put the card in a card reader attached to your PC.
Next, if you are comfortable with using a PC then you can download a photo recovery utility that will recover your pictures with this software called
Wondershare Photo Recovery (I once used this program bounded with some other software) from the following link(the program also
recover videos and music files):
Photo Recovery Windows (if you are running
Windows OS)
Photo Recovery Mac (for
Apple Mac OS X)
I hope all the information may help you! Best regards