I resolved the problem with these steps:
- delete table partition in internal storage:
Code:
sudo dd if=/dev/zero of=/dev/sdb bs=512 count=1
(my problem was to skip this step)
- make new file system with:
Code:
sudo mkfs.vfat -F32 -n "Cybook Opus" -s 8 -I /dev/sdb
Now all works
Thanks all!