And remember, important files like documents and pictures, should always be backed up regualrly because your hdd/ssd will die and loose all of them. Its just a matter of "when" so you have to be proactive to safeguard your data.
The dread “drive not formatted”error message generally indicates hard disk problems. This can occur for many different reasons including a computer virus, hard drive 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 say "yes" to format the drive.
2. Do NOT attempt to write anything new on this hard drive.
3. Download data recovery software to help you. There are many data recovery tools out there. But, no all of them could be efficient and useful enough. You should pay much attention to opt for a proper one.
Read more information about hard drive data recovery freeware here: http://www.freeware-fix.blogspot.com/2013/03/external-d...
4. Run the selected hard drive recovery tool to retrieve your inner files and pictures.
Note: Actually, in your case, if you have backed up everything important on another drive before, you would not have so many troubles. Therefore, you should learn a lesson to so regular data backup.