Can't help with KDE since I'm not using it. I prefer to mount things manually. For the H2O's internal memory I have this entry in /etc/fstab:
Code:
/dev/disk/by-label/KOBOeReader /mnt/kobo auto user,noauto,noatime 0 0
("KOBOeReader" being the default label Kobo uses for its internal storage)
So whenever I wish to access it, I just 'mount /mnt/kobo' and when I'm done I 'umount /mnt/kobo' and no need to concern myself with the peculiarities of the various frontends.