Dark data is the information your company collects but never uses—often 60-80%...

https://garrettwigp625.tearosediner.net/how-do-i-keep-ai-from-pulling-regulated-data-into-answers

Dark data is the information your company collects but never uses—often 60-80% of all stored data. This unused data takes up space, costs money to manage, and can hide security risks