The new attribute can be indexed if query speed is important. The schema can be extended by adding new class types too. Adding a class type is similar to adding a new table to a database. These extensible features open up many possibilities for Microsoft, third parties, or users to enhance the Active Directory uses. Dfs eliminates drive letters, which are a problem since there are a limited number of them available.
Mounted disks appear to be branches of the same storage root.
It's possible to mount multiple disks from different servers to the same Dfs name. Access to the data will be load balanced by Dfs. Multiple disks mounted can also serve as a high data availability solution. If one drive isn't available, the system will use another. These cases work best with read-only data.