Dark data is the info companies collect but rarely use—about 60-80% of all...

https://www.social-bookmarkings.win/dark-data-is-all-the-information-your-company-collects-but-never-uses-often

Dark data is the info companies collect but rarely use—about 60-80% of all stored data just sits idle. This hidden mountain wastes businesses up to $2.5 million a year in storage and management costs