Directory Disk Usage shows disk space used per folder. You can use this tool to check how disk space is being used in users' home folders. If you run Directory Disk Usage while logged on as a member of the Administrators group, you can check the use of disk space in folders on an NTFS partition, even if you don't have access rights to those folders.
You can also specify a maximum folder size, and Directory Disk Usage will mark any folders that exceed it and, if you choose, alert you to the problem.
DirUse is similar to DU used by UNIX.
DirUse Topic
File Required