Created attachment 126838 [details] screenshot STEPS TO REPRODUCE 1. insert a non-empty rewritable disc (I used a CD-RW) 2. mount the just inserted rewritable disc with Dolphin and do NOT close Dolphin 3. open K3b and enable "Do not eject medium after write process" option in "Advanced" section of its settings 4. click on "Format" button below the menu bar of K3b, check "Quick format" (also select "Force" if you are using a rewritable DVD) and click on "Start" button 5. when erasing is completed, switch to Dolphin window and try to eject the just erased disc via the device notifier OBSERVED RESULT notice that the button of the device notifier related to your optical device says "Click to access this device from other applications" instead of "Click to eject this disc" on mouseover. When you click on such button, Dolphin shows an error message on top and device notifier says "Could not mount this device". See the attached screenshot please. EXPECTED RESULT we should be able to eject the erased disc via the device notifier SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 5.18.3 KDE Frameworks Version: 5.68.0 Qt Version: 5.14.1 ADDITIONAL INFORMATION bug 417199 is related
I suspect that K3B sets some kind of hold on the disc at the systctl level which the applet cannot override, but I have absolutely no proof whatsoever of this and it could be completely wrong. :)
Cannot eject blank/non-mounted discs via Disks & devices applet regardless the steps provided here. See bug 469706