Thanks. The patch will be applied in the next fix batch. https://build.opensuse.org/project/monitor/home:sbrabec:branches:util-linux-round6 http://download.opensuse.org/repositories/home:/sbrabec:/branches:/util-linux-round6/openSUSE_Leap_42.2_Update In difference to CD-Plus/CD-Extra, Mixed Mode CD is a very wide definition. It is clean, what to do with CD-Plus/CD-Extra: Offer both audio and data. In case of Mixed Mode CD, it is more complicated. You can make CD's with arbitrary order of tracks and sessions. But it seems, that "data first than audio" is a widely used non-standard CD format. So it makes sense to backport the patch. The patch will also add possibility to mount a last usable session of multi-session CD with corrupted last session. However it will not fix incorrect behavior of blkid on a real standard conforming CD-Extra. And I even think that fixing your case is just a side effect.