On my PC where I'm using the Samsung M9T, I have a script that disable the head parking and still get the sounds. So, while it may be related to SOME sort of power-saving feature, I don't think it's the head parking specifically. It may be worth noting that in my case, when the noises happen there tends to be several beeps within just a few minutes, and these clusters of beeps happen about once or twice every day but aren't a constant issue.