Does your MacBook Pro vibrate /hum on hard, flat surfaces ?

I'm not talking about the electric current that is mentioned on the boards sometimes...
When I put my MBP on a hard surface like a wooden desk or glass table, I can feel some kind of vibration and a hum coming from the machine. You can even feel the back of the display slightly vibrating. Is that considered "normal" for this machine ? That guy in the Apple Store told me that all MBP's would behave like this...
Thanks for any input.

As I'm sure you can appreciate, not all drives are going to be perfect. While the vast majority of drives will behave as expected, some are simply going to be better than others and it's really pot luck which ones we get.
If you find, or even feel, that your drive is not within an acceptable limit for noise then contact AppleCare. The absolute worst thing that can happen is that they tell you it's within spec and they do nothing.
As for my 7200rpm drive, as it's an Hitachi which Apple do not use (at least this model - they may use other models) it's a slightly different case but what I can say is that it's no more noisy than the 120GB 5400rpm drive that it replaced. When I first installed it the drive was silent in all respects but it has developed a typical spinning/blowing noise of 2.5" drives, the same progression and time frame of the 5400rpm drive in fact. While a little disappointing I do need to take into account that it's no more noisy than the previous drive so with that in mind I really cannot complain. It certainly does not hum.
Additionally, some people are more adept at hearing these noises than other so be sure to keep everything in perspective.

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