this is a duplicate of some bug already reported and is caused by automounting.

can this be closed (it not being a problem with k3b as such) or should it be kept open to remind developers of this issue?

SVN commit 583863 by trueg:

Try unmounting the device before ejecting. Maybe a wrapper method would be better, one that
always unmounts before ejecting.
This is one step but is not guranteed to work all the time.

BUG: 121177


 M  +5 -0      k3bemptydiscwaiter.cpp  


--- trunk/extragear/multimedia/k3b/src/k3bemptydiscwaiter.cpp #583862:583863
@@ -349,6 +349,7 @@
 	}
 	else {
 	  kdDebug() << "(K3bEmptyDiscWaiter) starting devicehandler: no DVD+RW overwrite" << endl;
+	  K3b::unmount( d->device );
 	  K3bDevice::eject( d->device );
 	  continueWaiting();
 	}
@@ -418,6 +419,7 @@
 	}
 	else {
 	  kdDebug() << "(K3bEmptyDiscWaiter) starting devicehandler: no DVD-RW overwrite." << endl;
+	  K3b::unmount( d->device );
 	  K3bDevice::eject( d->device );
 	  continueWaiting();
 	}
@@ -499,6 +501,7 @@
       }
       else {
 	kdDebug() << "(K3bEmptyDiscWaiter) starting devicehandler: no DVD-RW formatting." << endl;
+	K3b::unmount( d->device );
 	K3bDevice::eject( d->device );
 	continueWaiting();
       }
@@ -573,6 +576,7 @@
     }
     else {
       kdDebug() << "(K3bEmptyDiscWaiter) starting devicehandler: no CD-RW overwrite." << endl;
+      K3b::unmount( d->device );
       K3bDevice::eject( d->device );
       continueWaiting();
     }
@@ -630,6 +634,7 @@
 
 void K3bEmptyDiscWaiter::slotUser2()
 {
+  K3b::unmount( d->device );
   K3bDevice::eject( d->device );
 }