The dread "not formatted" error message
generally indicates memory card problems. This can occur for many different
reasons including a computer virus, memory card problem, power surge, or
problems with the operating system. If you receive this type of error message,
it is important that you act carefully to keep your important data safe.
1. Do NOT click "Yes" to format
this memory card in case that the formatting process makes things worse.
2. Do NOT attempt to write anything new on
this memory card in case of any data loss.
3. Download a memory card data recovery freeware
to help you out:
http://www.freeware-fix.blogspot.com/2013/03/memory-card-recovery.html
In fact, this freeware has ever
successfully saved all the inaccessible data of my friend off from his camera.
So, I believe it can also work successfully on your camera memory card, too.
Simply read more information of this
freeware here:
http://www.freeware-fix.blogspot.com/2013/02/photo-recovery.html
4. Do not save or back up all the restored
data on the same memory card in case of any data loss.
5. After the data recovery process, simply
format this memory card to see whether it can work functionally as before.
In the future, you should learn a lesson to
be more careful about your data and always back it up well.