And to complicate things further.. while an end user might not be able to set acoustical management on the Seagate drives if you buy their DB35 DVR drives you will be getting a dead quiet, higly reliable drive. This is why Weaknees sells them almost exclusively. Personally I wouldn't use the Western Digital as I see their failure rate being much higher in my place of business and in prior Tivo's I've owned. I have a pair of the DB35 750gb's in my HR10-250 and they can't be heard in our home theater.