this post was submitted on 09 Mar 2025
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I have Audio-CDs from the 80s that are still playing 40 years later. And I have CDs with deep scratches that also play without problems.
And I have PDO pressings of Faith No More albums that are almost 40 years old and have just started to rot. Common occurrence with PDO pressings apparently; one manufacturing error is all it takes.
Disk rot usually happens when air gets in contact with the reflective coating and oxidises it. With CD's, it's actually the top side you need to be worried about, as it's right there under a thin lacquer coating. Any ding to that can expose the layer or just literally chip off a chunk of data.
At least on DVD's it's sandwiched inside the disk, so usually the only reason is a manufacturing error, and not really something the user can cause.