Disk 2 went to "Device is disabled, contents emulated" and although it lists the btrfs filesystem, it says 'Unmountable: No file system'. Checking the filesystem status results in 'checksum verify failed on 1312205111296 found 7723BE85 wanted 5C832EA0' and 'bad tree block 1312205111296, bytenr mismatch, want=1312205111296, have=15350558693598887749'. It's a very old drive and it might be failing. The error occurred when trying to run a VM which failed, the system locked and libvirt is located on the same drive. What would be the best steps forward for recovering the drive or the data on it?