Originally Posted by knc1
Not required, just being a directory of that name rather than a file is enough.
Plus, changing the permissions of a file does not block 'root' from changing or removing it.
Put an empty, hidden file inside the new directory if you wish.
But that is more likely to be forgotten by you than to inconvenience the OS.
mntroot script does not effect the /mnt/us part of the file tree, that is on a different backing store (partition 4).
The rw/ro status of the root file system does not propagate to other backing stores.
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