Dark data is the information companies store but rarely use—up to 60%-80% of it...

https://mag-wiki.win/index.php/How_Do_I_Extract_DICOM_Metadata_Across_a_Huge_Imaging_Archive%3F

Dark data is the information companies store but rarely use—up to 60%-80% of it sits inactive. This unused data can rack up storage costs, create security risks, and add noise that throws off AI projects