Somehow the format command worked finally! Before it didn't.
Do I have to format the system-partition also to ext4? (in the repartitioning tutorial with acronis Disk Director, you mention to format the system also to ext4.
I tried al lots of things, so, i am afraid i had to rebuild reader, system and data from scratch..
In Acronis Disk Director i can also make ext3 partitions.
What do you recommend?