Is this the test where you hold up a CD to the light and see if there are visible pinholes? I have (at least) one like that, although it was still playable as of a few years ago (I hadn’t tried it out again since I copied it to a hard drive). The CD is about 36 years old; I bought it used in 1996. That’s before I heard about CD rot, so for all I know, the pinholes were there when I bought it, or for that matter when it was pressed ca. 1987. In other words, I’m not sure it’s a test of anything unless I was there doing QA when they pressed it.
I have had DVD-Rs (which I used for storage in the days before >1TB hard drives) go unreadable, but even when I burned them I figured they weren’t permanent.
