Dark data is information companies keep but never use—about 55% of stored data...

https://www.seo-bookmarks.win/dark-data-is-the-inactive-or-unused-data-stored-but-never-analyzed-around-55

Dark data is information companies keep but never use—about 55% of stored data goes untouched. This inactive data adds up to a $2.5 million waste on storage and increases security risks