okay. It was just a guess as I felt also slowdowns with bigger file operations. And could not think of any other reason as else exfat is stable. I was used (times of Nokia maps) to have whole world on device. But at that times is was around 11G. Now with OpenMaps just Germany only is a few GBs. And I like to have a few countries I need to travel to always on device. But I will (need to learn to) live with it Anyway, a real big thank you