Weird noise out of the hard disk

So, as i was listening to the music throgh earphones, i could hear a noise of the harddisk. It sounds like an old G3 apple laptop did.
It sounds like it's blending something, the sound is so Extra-terestrial-science-fictional.
You can hear the hard disk change songs and you can hear the hard disk turning around from a good distance.
you can hear it very good while charging.
impressive though.
Is it normal? Is it OK?
tnx.m.

I've had that message appear when I connect my car charger sometimes. And it's the car charger they sell at the AT&T store made specifically for iPhones. It doesn't do it every time, just once in awhile.
I've never had it just appear out of the blue, though.

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