Are external hard drives magnetic or something?

I have a Seagate external hard drive and whenever I hold it up and spin it slowly around a little, it feels really weird like it's magnetic or something is spinning really fast inside it (I don't know how to describe it o.O). I'm just wondering why it feel like this whenever I move it around? And is it... show more I have a Seagate external hard drive and whenever I hold it up and spin it slowly around a little, it feels really weird like it's magnetic or something is spinning really fast inside it (I don't know how to describe it o.O). I'm just wondering why it feel like this whenever I move it around? And is it bad for the hard drive if you spin your hard drive around slowly?
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