It's good to note such damages, but it's also still good to test it too . . . both matter. Superficial damage (including pin hole scratches through the label/lacquer) is good to note, but is still just superficial. OTOH, there's those borderline cases where a disc is fine on a number of drives/machines, but flakes out on those with weaker drives. (and, of course, most modern PC drives are going to be far better about that than old consoles or music players for that matter)
Hell, don't forget the mess Pier Solar ran into over their pressed CDs for the first edition releases . . . perfectly acceptable for modern drives and even for CD-DA, but not acceptable for data usage on many Sega CDs. (copying and burning to CD-R solves that though. . . but you can't do that to systems with disc security)
There's also the separate issue of top scratches potentially leading to real disc rot . . . or something functionally identical to it. Holes small enough to not cause read errors can still lead to oxidation/corrosion that may later lead to general failure.
Oh, and of course, these problems don't apply to DVDs at all, since they're sandwiched rather than lacquer coated. (so only bottom scratches or actual cracks matter)
Also note that it takes some experience to know how to pick out a real lacquer hole scratch vs just flaws in the metal layer of the disc. (quite a few -especially old- CDs I've seen are peppered with little pin hole sized flaws where the metalized layer is thinner or even perpherated) Those flaws shouldn't be a problem and, unlike actual surface holes, can't lead to "rot" either. (corrosion)


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