It IS the DVD drive spinning at 12x causing that noise, not the fan.Originally Posted by Sovieto
"The most noticeable fault of the system, the one you'd be most likely to hear about from the largest number of users, is how loud it is. Sitting idly in the Dashboard system interface, the 360 isn't so bad: It's not whisper-quiet, but not annoying. Pop in a game, and it's a whole other story. When that DVD-ROM drive spins up to full 12x speed, it puts out a ton of noise. Fortunately, it spins slower when playing DVD movies, and the HD-DVD add-on drive is very quiet."
"As we mentioned before, the noise generated by those rear fans isn't the 360's biggest problem. It's the optical drive noise when running at full speed while playing a retail game."