btrfs-show-super version (return code: 0)
ERROR: bad magic on superblock on version at 65536
superblock: bytenr=65536, device=version
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btrfs-show-super --help (return code: 1)
btrfs-show-super: invalid option -- '-'
usage: btrfs-show-super [-i super_mirror|-a|-f|-F] dev [dev..]
-f : print full superblock information
-a : print information of all superblocks
-i <super_mirror> : specify which mirror to print out
-F : attempt to dump superblocks with bad magic
-s <bytenr> : specify alternate superblock offset
btrfs-progs v4.4