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  • It is not very clear to me why you can't get xfs_repair, in some extreme case xfs_repair -L working. Commented Mar 2, 2023 at 23:24
  • I previously (before partial success mounting the partition) tried the -L flag with the same results (no secondary superblock) but just started it again because why not? Worst case I start over with ddrescue. Commented Mar 3, 2023 at 3:56
  • consider using readonly mounts and/or snapshots / copy-on-write overlays so you don't have to repeate ddrescue after every botched experiment. with snapshots you can just revert any changes made. unfortunately its very difficult to tell remotely what else could be done, it depends on how much data is missing where / the specific nature of the corruption. you can also try your luck with xfsdump. Commented Mar 3, 2023 at 9:19