Just had an idea what the reason could be:
When I set Storage to SD or CF, I see a short "Ejected" message appearing on the screen if I connect USB. That seems to mean, the card is ejected from the actul system and instead used exclusively for the USB connection.
However, I have set some apps (KDEPIM etc.) to use /hdd3/Documents/... as their data storage path, i.e. these paths may be used all the time thus umounting / ejecting media could fail. That might cause such an error message.
KDEPIM applications are always kind of active due to fastload, so closing them might not help, in case they are really the reason.
What do you think?
How can I solve that problem?
Would it help to set the apps to use /home/zaurus/kdepim etc. and only create a link from there to /hdd3/Douments?
Thanks
daniel