Dark data is the inactive info your company stores but doesn’t use—often 60-80%...

https://mega-wiki.win/index.php/Dark_Data_and_AI_Hallucinations_%E2%80%93_Is_There_a_Connection%3F

Dark data is the inactive info your company stores but doesn’t use—often 60-80% of all data. It increases risks like ransomware exposure since old files may lack proper security