Dark data is the info hidden away in your storage that no one’s using—think 60%...

https://zandersexcellentblog.quillnesty.com/posts/why-does-dark-data-make-search-results-noisy-inside-the-company

Dark data is the info hidden away in your storage that no one’s using—think 60% to 80% of inactive files just sitting there. It’s a real problem because it wastes space, drives up costs, and adds noise that messes with AI projects