Fan or Hard drive ?

I have a new late 2012 27" iMac and it sounds like the fan is pretty loud. I will most likley just deal with it because my computer always remains cool and has no screen issues. Though I began to think. Could it be the hard drive making the noise? how could i tell?

jav6454 said:

Download smcFanControl. Then look at the rpm of the fan. If they are high (>3200rpm) then it is the fan.

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I have it always says around 1200 rpm.

jav6454 said:

Then its the hard drive.

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It couldnt just be a loud fan? THe noise could be be confused for either.