On  6.04.2018 16:32, Ben Parsons wrote:
> Hi,
> 
> I just had an unexpected restart and now my btrfs pool wont mount.
> The error on mount is:
> 
>     "ERROR: unsupported checksum algorithm 41700"
> 
> and when running
> 
>     btrfs inspect-internal dump-super /dev/sda
>     ERROR: bad magic on superblock on /dev/sda at 65536
> 
> I saw a thread in the mailing list about it:
> https://www.spinics.net/lists/linux-btrfs/msg75326.html
> However I am told on IRC that Qu fixed it using magic.
> 
> Any help would be much appreciated.

Try recovering the super block from one of the backup copies via
"btrfs rescue super-recover /dev/sda"

> 
> Thanks,
> Ben
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