Copy the block partition (not the mounted files) to a same size or larger
blank block partition using ddrescue or gddrescue. Try to mount that read
only and copy the files off. If it doesn't work, try to restore the
superblock using one of the tutorials online.

On Sat, Aug 29, 2020, 2:52 PM Dimitris via Dng <dng@???> wrote:

> On 8/30/20 12:35 AM, golinux@??? wrote:
> > advice is most welcome.
>
> maybe a "long shot" , but did you try another cable/adapter/case for
> that disk?
>
> a few badblocks (?) would slow down the whole disk and maybe not open
> some folder(s)...
> "input/output error" and smart "read failure" could be something else.
>
>
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