this post was submitted on 08 Apr 2024
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There was still a wear layer below the data layer which could be resurfaced. So the services worked.
Commonly it worked by removing some material from the bottom wear layer to remove the damaged bits, so it didn't work forever. You would eventually run out of material to remove and trying to repair it would result in a catastrophic failure of the media.
Writable disks however, not so good.