Danke für die Antwort.
Oct 30 16:32:15 Tower root: mount: /mnt/christiane_one: wrong fs type, bad option, bad superblock on /dev/sdf1, missing codepage or helper program, or other error.
Oct 30 16:32:15 Tower kernel: BTRFS error (device sdg1): super_num_devices 1 mismatch with num_devices 1 found here