01-06-2018 07:18 AM
If you look at the end of a flash drive you will see the circuitry is inside the metal shield that you are referring to and not connected to the metal shield. If the shield plays any part other than support it would be that of ground.
Most pc circuitry is of the 12 - 18v range so even if you did touch a circuit it wouldn't harm you.
Stop worrying, it causes wrinkles.
Important files = Backed up files