I have an unmountable BTRFS filesystem disk or pool, what can I do to recover my data?   Unlike most other file systems, btrfs fsck (check --repair) should only be used as a last resort.  While it's much better in the latest kernels/btrfs-tools, it can still make things worse.  So before doing that, these are the steps you should try in this order:   Note: if using encryption you need to adjust the path, e.g., instead of /dev/sdX1 it should be /dev/mapper/sdX1   1)
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