Does your files and folder in flash drive or External storage drive got missing after you inserted it to other computer? Don't worry to much, it's not missing, it's just hidden in your flash drive or storage drive. Here a dos command on how to do it.
1. press Windows+R keys or click Start>RUN
2. Type CMD and press enter
3. type the drive letter for your flash drive or external storage device. Example D: and press enter
4. then Type attrib /d /s -r -a -s -h *.* and press enter. and its done