<pre><code>admin@kevin:/$ sudo mount -t btrfs -o ro,usebackuproot,rescue=all /dev/mapper/trim_30790aca_9b8a_4308_bbc6_4310182aec99-0 /vol4
mount: /vol4: can't read superblock on /dev/mapper/trim_30790aca_9b8a_4308_bbc6_4310182aec99-0.
dmesg(1) may have more information after failed mount system call.
mount: (hint) your fstab has been modified, but systemd still uses
the old version; use 'systemctl daemon-reload' to reload.
</code></pre>
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