The D4 (authoritative restore) makes the replica tree on one member authoritative for all the members of this replica set. This is done by stamping a new unique file ID on every single file and folder. To get these new files replicated to all the partners, you must also initiate a nonauthoritative (D2) restore on every member of the replica set.
This D4 (authoritative restore) procedure should be performed only in consultation with your Microsoft Product Support provider. The D4 process is a last resort only used in selected situations. For more information about performing an authoritative restore, see article 290762, "FRS: Using the BurFlags Registry Key to Reinitialize File Replication Service Replica Sets" at http://support.microsoft.com/?id=290762.