I upgraded the 80GB HDD in my Mac Mini to a 250GB western digital one last night, and it all went well. The Mini is primarily my media centre hooked up to some externals drives for my itunes library, so the speed of it is not massively important. But i noticed this morning when i was transferring files off my MPB to store on it that its slow to switch between apps and i get the spinning wheel for a second or two, plus its noisier than it was. Can anyone offer any suggestions as to why this may be? Thanks in advance. Clarkee.