No, priority only determine where new "processed" items go, it will not move things around once they are already stored somewhere. You will need to remove the cobble from the system and reintroduce it so the system can "process" it again and determine which storage should accept the cobble depending on priority, formatting and existing items.i might be wrong, but if you set priority on storage bus higher than on drives, shouldn't it move cobble from drive to dsu?