Flash drives are very susceptible to worms/”virus” infection.
One behavior is hiding your files/folders in a blank folder name and set it to system attribute.
Then add a shortcut to open that hidden folder and also infect your system.
First, SCAN YOU DRIVE AND REMOVE ANY INFECTION.
Now, to recover the files…
Revealing hidden files and folders from an infected flash drive, use the command below.
attrib *.* -h -s -r /s /d
This will now show the folders and files, rename the _blank_ folder to your preferred name and recover your files. =)