13" MBP having fan or HD vibration

I purchased a 13" MBP about a month ago and upgraded the hard drive to the Seagate Momentus 7200.4 ST9500420AS 500GB 7200 RPM. I don't know if this is the cause or not but I can feel a slight vibration all the time, even when there's little activity going on (I checked the activity monitor). The vibration is quiet though but I can feel it on both sides of the trackpad armrest. I am not sure if it is the fan or the hard drive. Does anyone who upgraded the hard drive notice this problem in the 13"? My fan speed is around 2000rpm.
Thanks.
Linh

I have the 17" with the 7200rpm and have similar noise and vibration. I can feel it both on left and right, but the noise on the left side even changes when I slightly rest my hand on the left side....
Wondering, even if you have the smaller model, if you sense the same symptom.
I asked a salesman at the Apple Store and he felt pretty certain that the noise and vibration are caused by the faster HD.

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Message was edited by: Pierobon
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