I lost my folder why?

Folder on Flashdisk (Removable Media) lost, but at the time of the check the drive properties are not empty. I lost my folder why? Possible lot.

However, the current case every Flashdisk connected to your PC / Notebook, it will be damaged (not the hardware but the readings from the system), folders and files do not exist. We’re trying to do from the Command Prompt to use the attrib command, but the results still can not.