How to mount multisession udf bd-r disc?

General system Newbie
1

Hi people.

Using EOS/KDE here.

I have some multi-session BD-R discs that I’m unable to mount the normal way in KDE (tray pop-up → click mount).

It does not show anything after inserting the disc.

I can only mount with: mount -t udf -o ro,lastblock=0 /dev/sr0 /mnt/bd

I want to be able to mount the same way as single-session discs in KDE, tried a lot of suggestions from chatgpt but none worked.

How can I accomplish this?

Thanks.

2

This is another AI answer. Maybe it differs from yours.

full auto-mount like single-session discs is not really achievable — that would require udisks2 to both detect the UDF filesystem (it can’t without lastblock=0) and pass that option (it’s not in its allowlist). You’d essentially need to patch udisks2.

But the closest native KDE experience is a custom Solid Device Action — a clickable entry that appears in the Device Notifier popup when you insert the disc, just like the built-in “Open with Dolphin” action.

A real kde user can help you maybe further with some solid advise.

3

The second option is too complicated for me, but thanks anyway!

I wonder why I’ve been successfully auto-mounting multi-session discs since the late 1990s on Windows with no trouble at all…

4

Hello, I think claude is really wrong here (guess it was not trained properly lol). As stated here https://storaged.org/doc/udisks2-api/latest/mount_options.html

Since the 2.9.0 UDisks release a new way of overriding builtin set of mount options is supported. This is primarily targeted to sysadmins with system-wide write access (e.g. /etc/udisks2 or udev rules) and essentially transfers responsibility for security and data consistency to their side.

Ah, RedHat, what would we do without thee, always thinking about our security :smile:

Another possibility of overriding mount options is from the udev rules.
Definitions coming from udev rules will override respective keys from both the config file level and the base builtin mount options

emphasis mine

So, yes it’s possible to override the builtins. It’s really cumbersome, but it’s doable. Things that are really hardcoded now are nodev and nosuid.

You can start from /etc/udisks2/mount_options.conf.example. Copy the file to /etc/udisks2/mount_options.conf and adjust the _defaults and _allow for udf.

Don’t forget to check out the examples on the documentation page.