External hard drive(pen drive, harddisk) inaccessible direct formate opction show

start -
run-
type 'cmd' ok
type chkdsk E: /f or
chkdsk /f E:

 Here E is the letter of the USB or external drive – or any drive for that matter

https://www.thewindowsclub.com/format-drive-run-check-disk-using-cmd