Dark data is the information organizations collect but never use. It can be 60...

https://xeon-wiki.win/index.php/What_is_KAPPA_Data_Services_and_What_Can_It_Extract%3F

Dark data is the information organizations collect but never use. It can be 60 to 80% of your stored data, sitting idle and costing companies up to $2.5 million a year in storage and management