This may be similar to What are /media/[user]/disk, /media/[user]/disk1, etc.? which was asked 10 months ago but no one answered.
I was just using my Ubuntu Studio 22.04 machine with XFCE 4.16. and suddenly noticed there's an extra "509 MB volume" with the label disk, i.e., /media/(myuser)/disk.
Here are the contents of /media/dlm/disk/:
$ ls /media/dlm/disk/
command-chain data-dir etc gnome-platform lib meta sbin snap usr var
$ $ ls /media/dlm/disk/command-chain/
desktop-launch hooks-configure-fonts
$ ls /media/dlm/disk/data-dir/
icons sounds themes
$ ls /media/dlm/disk/etc/
bindresvport.blacklist fonts gnome init.d ld.so.conf.d profile.d sensors3.conf X11
emacs gai.conf gtk-3.0 ld.so.conf presage.xml pulse sensors.d xdg
$ ls /media/dlm/disk/gnome-platform/
$ ls /media/dlm/disk/lib/
udev x86_64-linux-gnu
$ ls /media/dlm/disk/meta
gui snap.yaml
$ ls /media/dlm/disk/sbin
ldconfig ldconfig.real
$ ls /media/dlm/disk/snap
manifest.yaml snapcraft.yaml
$ ls /media/dlm/disk/usr
bin lib libexec sbin share
$ ls /media/dlm/disk/var
lib
I don't remember doing anything to mount an archive or any other volume. I mean, I guess it's harmless? But... I didn't ask for it, so it shouldn't happen, and if it does happen, it should be reversible.
For tidiness' sake, I'd like to unmount it, but the volume is "busy".
So I wonder. Who created this volume? Who is using it so that it's busy?