Magic Mouse causes noise in MacBook Pro while scrolling

Hi everyone,
I just discovered a kind noise which I'm not sure is a problem or not. I'm sitting in an extreme quite room and my windows are almost completely closed, so I can hear the sounds my MacBook Pro (Mid-2010) is making very well. I can hear the fans spin and the hard disk's reading noise. Just now when I'm scrolling up and down with my Magic Mouse, I realized that every scroll I make causes my MacBook to emit a kind of noise that sounds like the noise the hard disk would make when it is reading/writing. That sound appears to be emitted from the part where the logic board is housed, i.e. the left side (the side with the ports). I note that this noise can only be heard in an extremely quiet environment. I wonder if anyone else also has this little noise issue? Thanks.
Regards,
James

I have the same problem on my iMac.
In some applications, especially the apple ones, i can hear a odd noise while i use the vertical scroll.
I dont no have idea what is causing that thing.
It seems that only you and me can hear that sound. Maybe we have some kind of special hearing.

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