I'm using KDE 4.3, and everytime that I use the unmount plasmoid to unmount a external device or Dolphin to do it, it complains that the device is busy.

The strange thing it's that in fact the device is not busy, and indeed the device is unmounted and the device directory is removed...

While the Device Plasmoid error message is more like "device busy", Dolphin is more explicit saying that it can't remove the directory...

But in fact everything works as it should...

Any ideas?

Removing (as root) the /media/.hal-mtab and /media/.hal-mtab-lock files solves the problem