File Owners Report
The FolderSizes File Owners report shows which users are consuming the most disk space on your file servers and storage devices. This is a very useful report for identifying users who may be hoarding files or using more disk space than they should.
FolderSizes will show a security identifier (SID) string value for users that have been deleted from the system. This can be useful for identifying orphaned files owned by users that are no longer part of your company's domain.
You can double-click any File Owners report entry to drill down into the file system and see exactly which files and folders are owned by a specific user.