If u have this rare issue with your storage /usb that ur USB not shown file and folder that are actually in that USB Flash Drive . The storage of Drive shown the file size on the drive but file/ folder are not there it solution is that u have to open the DOS prompt and write their given below string........
attrib -h -r -s /s /d flashdrivename\*.*
It is your problems solution.
attrib -h -r -s /s /d flashdrivename\*.*
It is your problems solution.