Also at a bank, a file/database server that had two physical sides. Each side could grab a cartridge containing basically a cd-r, push it into a reader, read the track of data based on a file system like record in an oracle database. This was done to meet SEC Rule 17a-4 (Write Once Read Many) requirements.
It was old, like "Side A got stuck have to run to the DC to fix it" old and you would get errors accessing those files but not side B files. I'm guessing 15+ years. Weirdly you can grab a PDF off this thing in less than 2 seconds. This had to exist at other organizations but this was the only one I saw.
Now Azure and AWS provide the same service for pennies on the dollar.
My father worked IT with a medical record imaging system that is very similar to what you're describing. They called them platters, and they were like CDs except the size of a dinner plate or so if I remember correctly. And there was basically a giant jukebox system to switch them out.
Sounds like a proper old WORM drive with integrated media changer - had seen one in telco I worked at, it's also referenced by Plan9 file server which used one as its main storage.
It was old, like "Side A got stuck have to run to the DC to fix it" old and you would get errors accessing those files but not side B files. I'm guessing 15+ years. Weirdly you can grab a PDF off this thing in less than 2 seconds. This had to exist at other organizations but this was the only one I saw.
Now Azure and AWS provide the same service for pennies on the dollar.