On Sat, Jun 6, 2020 at 2:47 PM Bob Goodwin <bobgoodwin@fastmail.us> wrote:
When I put a Fedora .iso on a flash drive it leaves read-only files that
I always have difficulty clearing if I want to reuse the flash drive for
something other than media-writer.

What should I do to clear the drive?

If you use Fedora Media Writer it will take over the whole stick regardless of size, but when you're done it conveniently offers to restore the disk the next time you run it.