Hitting another metallic tray several times. A more sturdy/dry sound with less hang time. The sound is reminiscent of a thick bell or gong. Mic: schoeps c-mit 5.
I recorded the fan on quite loud and i opened and closed the cd drive on my hp eletebook 8460p, different laptop models have a different frequency from the fan and different cd drives make a different sound when checking it. Recorded from the internal microphone.