Running Opensuse 12.3, with KDE 4.10.1(from the upstream repository).
The device notifier opens up at regular intervals every other minute like clockwork, even when there is no new devices.
I have 3 USB drives connected, all mounted under /var/run/media/username/. At least one of the drives are active and it seems it is this drive that are expanded within the device notifier when it opens up.
It is a bit annoying that the device notifier acts like a new drive has been detected and opens up and no new deivce.
I have tried closing the application which uses the drives. Deleted the symlinks from the drives. None of it worked. Then I closed all open applications. Still no effect.
Edit: By the time I was finished writing this I had tried one last thing. A plasmoid on my desktop show all my harddrives and its available free space. When I closed that one, the device notifier went silent. No more popups every other minute.
So it seems the free space plasmoid is causing hawock with the device notifier. Looks like a bug, but to which one.