On Sun, 14 Mar 2021 22:44:26 +0100 Erik P. Olsen wrote:
Is the drive a brick or can I perhaps regenerate the superblock somehow?
There are lots of copies of the superblock. I had a drive go bad like that once and was able to use tools (the names of which I no longer remember - sorry) to print info about where all the superblock copies were located, then use mount options to try and mount using each superblock till I got to one that worked (also mounting read only, of course). Managed to recover some files, but a lot of the data was as corrupt as the superblock.