Hello Zrebel,

sorry if You were irritated by my direct entrance in this discussion - i just wanted to say something like:
"Oh, wow, yes, i've had the same problem and already tried to solve it myself - now i searched on this forum for it and promptly found the solution here, and i'm happy about this!"

...for the multiuser thing: Yes, calling a script sounds plausible for me and its new to me that this is possible with the udev stuff. (I'm the classical fixed-fstab guy and didnt read much yet about udev.). Thanks for the tip.

Greetings