External drive gets mounted twice

Hello all, I've installed openSUSE 42.2 and so upgraded to TDE 14.0.4 (previously I couldn't on my old 13.1, something broke so I stayed at 14.0.0). I don't know which of the two is responsible, but now, when I plug in an external drive, it gets mounted twice. On my desktop I see the drive itself, and the partition. For example, when I plug in my 16GB mac formated usb key, I get both "14.8 GB removable device", mounted on /deb/sdg, and "macUSBDrive", mounted on /dev/sdg1. Of course the former throws an error if I try to open it. This is not so bad and I can live with it, but I wonder where this is distribution specific, machine specific or if you all see this too. Regards, Thierry