Hidden folders in a Flash drive include the programs that assist the flash drive function appropriately.
How To View a Hidden Folder in a Flash Drive:
Insert the flash drive right into an open USB port. Press “Start,” click “My Computer” then click on the symbol for your flash drive.
Expand the “Tools” tab on the top of the page.
Click on the “View” tab. In the list, check the circle next to “Show Hidden Files as well as Folders,” which is under the “Hidden Files and Folders” folder. Click “Apply” to conserve the modifications.