Dark data is the information companies store but never use—up to 55% of all...

https://mag-wiki.win/index.php/Dark_Data_and_AI_Governance:_What_Should_Be_Blocked_from_Ingestion%3F

Dark data is the information companies store but never use—up to 55% of all stored data just sits there. This hidden stash matters because it adds to storage costs, risks data breaches, and clutters AI projects with useless noise