plastic media optical disks don’t last 100 years, but glass media optical disks do. They exist. My family’s small business used to sell, refurbish, and maintain big jukeboxes for 12 inch Write-Once, Read-Many glass optical disks (in these big minidisc-like cartridges) for customers like big banks that needed guaranteed 50 year archives.
The tech isn’t yet 50 years old, although accelerated aging is a well-understood field and the margins are good for glass media. However, the tech is 30-40 years old and the early disks ARE still readable.
