It sounds like you've got a troublesome USB flash drive problem. Do you have anything important on this drive?
If you do, you can try USB drive data recovery freeware that can restore all your inaccessible photos back for free:
http://www.freeware-fix.blogspot.com/2013/03/disk-drive-not-formatted-error.html
This data recovery freeware has offered you four advanced data recovery modes to process almost all your data recovery problems, such as deleted photo recovery problems, formatted drive or memory card data recovery problems and even corrupted drive or memory card data recovery problems, etc. So, I trust this freeware will also do its utmost to get back your inaccessible photos back.
Read more detailed information of this freeware here:
http://www.geeksdo.com/data-recovery/
PS: Next time, you'd better learn a lesson to back up everything important well in case of similar data recovery problems.
You can try some data recovery software. You can see
How to recover deleted files
It tells the steps how to perform data recovery.
If above does not work, you may have to format the USB Flash Drive(use quick format), and then use data recovery software to scan again USB Flash Drive and recover your files. You can refer to this tutorial
Recover deleted files after format
It should be the file system problem. Usually a usb drive should be formatted to FAT initially instead of NTFS. Recommend you try the USB on another computer and see if the problem still occurs. If yes, then try format it from Disk Management of your computer. If you can't format, use TestDisk (also a command line tool) to fix the file system error. You can also see from this blog post to learn more about the possible reasons or solution. Regards
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