I came across this, which describes a "torture test" more rigorous than most accelerated life tests: https://www.zdnet.com/article/torture-testing-the-1000-year

I came across this, which describes a "torture test" more rigorous than most accelerated life tests: https://www.zdnet.com/article/torture-testing-the-1000-year-dvd/ https://www.zdnet.com/article/torture-testing-the-1000-year-.... TL;DR: The CD-R's didn't survive the process, but the M-discs did, with their data intact.