Also,the only noise problems I've had with my discs have been from them being dirty,like after riding in the rain. They usually quiet down after a couple dry stops. Otherwise,cleaning the rotors usually takes care of it.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X