Ah! Thanks.
On Mon, 11 Jan 2021 16:58:34 -0500
Matthew Miller <mattdm(a)fedoraproject.org> wrote:
On Tue, Dec 22, 2020 at 02:24:25PM -0800, Geoffrey Leach wrote:
> 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
> ..................................^
The one device has a partition table and at least that one partition.
The other one just uses the whole block device without partitioning.
You can do this with any USB stick as well.