The reason to do this is to protect data on thumb drives full of
archives.
When searching for information, most of the discussion
was from people who had root file systems which had been
corrupted so the mount process mounted them read-only.
In this case, all is well and the drives being mounted
contain archives which one doesn't want to lose so mounting them
as read-only would be a good way to protect them.
Thank you.
Martin McCormick
