SD card ejecting on a Thinkpad x61

[Husse]

It's mounted by pmount
This is what mounts removable devices unless they have an entry in fstab
There is actually a pmount-hal but that's another story
You find devises mounted by pmount in /etc/mtab
You say eject - shouldn't it be unmount?
With a a permanent entry in fstab you must be root to mount/unmount

[Husse]

Your error(s) seem a bit odd
You could try to use pumount - you need to install it first though
It's the umount of pmount