What I have here is the result of two mounts of mp3 players, from
different manufacturers, followed by the (edited) output from findmnt.
What interests me is the source assignment. Any thoughts as to
what might be causing this, or the significance of the change?
% mount UUID=4C2B-B6B0 /mt_test --options rw,user,umask=0000
`-/mt_test /dev/sdb1
..................................^
% mount UUID=1874-44DE /mt_test --options rw,user,umask=0000
`-/mt_test /dev/sdb
..................................^