On 10/12/2023 02:49, Stefan Monnier wrote:
"magically" mounted as `/media/root/<UUID>`.
[...]
Any idea who/what does that, and how/where I can control it?
This path is used by udisks, however I am unsure what may cause automounting for root.
I would check udisksctl dump udevadm info --query=all --name=sdafor various hints related to udisks. Perhaps a better variant of udevadm options exists.