https://bugs.winehq.org/show_bug.cgi?id=56877
--- Comment #8 from Fabian Maurer dark.shadow4@web.de ---
We do return drive serial numbers (via dbus) but not every drive supports it.
Ah, alright. It didn't work because of my sandboxing that blocked dbus access. I didn't expect dbus to be an extra loop so I missed it, thanks for the explanation.