On 22/01/2022 22:23, Phil Turmel wrote:

That said, I highly recommend copying the disk showing read errors onto 
another disk, keeping the log of sectors replaced by zeros. Then 
performing a file by file backup from the degraded array, using the copy 
instead of the troubled drive.

I believe there is also a way of injecting a hardware error onto a 
drive. Unless you can take a backup of the backup :-) I wouldn't 
recommend it at the moment, but there's some ATA command or whatever 
that tells the drive to flag a sector as bad, and return a read error 
until it's over-written.

Obviously, doing that on the sectors that weren't rescued, and then 
doing a scrub, is going to recover your data if it's both possible and 
done right :-)

Cheers,
Wol