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....btrfs without problems. But; when I try to mount it, it fails to mount with the below error messages. But the USB memory works fine with other filesystems (ext4, XFS etc.). So, the hardware is not faulty. tarkane@tarkane:~$ sudo mkfs.btrfs -d single -n 4096 /dev/sdb1 WARNING! - Btrfs v0.18-26-g0030f1d IS EXPERIMENTAL WARNING! - see http://btrfs.wiki.kernel.org before using fs created label (null) on /dev/sdb1 nodesize 4096 leafsize 4096 sectorsize 4096 size 983.98MB Btrfs v0.18-26-g0030f1d tarkane@tarkane:~$ sudo mount -t btrfs /dev/sdb1 /mnt mount: wrong fs type, bad option, bad super...