Kingbox21 wrote...
Disk looks good, they worked about a month ago.
It seems obvious (to me, anyway) that it is a read error.
If two different disc drives couldn't read the disc(s) properly, the disc(s) themselves would be suspect. Not all surface defects on an optical medium are visible to the naked eye.
I suggest cleaning them using a suitable method and try again. Google to find some common techniques.
If you notice any large overly-worn area (usually a slight discolororization than runs the full diameter of the disc) on the surface it may have been abraded enough that it has become unreadable in which case, cleaning won't help. But it's worth a shot. There are also some commercial disc cleaners that claim to be able repair some minor surface defects though I have never actually used them myself.