Dark data is the inactive information companies hold but don’t use—often 60-80%...

https://record-wiki.win/index.php/What_Does_%E2%80%9CData_Stays_Where_It_Lives_Until_Needed%E2%80%9D_Mean_in_Practice%3F

Dark data is the inactive information companies hold but don’t use—often 60-80% of their stored data. This hidden data can silently eat up storage costs and even lead to $2.5 million wasted annually in inefficient management