Dark data is the info companies collect but don’t use—up to 55% of all data....

https://touch-wiki.win/index.php/What_is_Transparent_Move_Technology_for_Tiering_Cold_Files%3F

Dark data is the info companies collect but don’t use—up to 55% of all data. This unused data still costs money to store and can create risks like security gaps. It also clutters AI projects, adding around 70% noise that makes results less accurate