Not sure I wouldn't think it would even have a hard drive in honesty, as thin as it is and with the 2gb storage I would really expect it to have to be flash memory. It's not completely uncommon for electronics to hum but very few can people hear it. I suppose it's also possible there a tiny fan on the cpu or something but with ARM I don't think it would be needed.
My only worry if I heard a noise would be something dodgy with the battery, the odds are against that though. All in all I'd say it's probably nothing to worry about.
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