Hard Disk Upgrade on my 27-inch Late 2009 iMac 11,1

Hello Everyone,

I would like to upgrade the harddisk in my iMac from a Seagate 1TB model to a Seagate 2TB model.

I have read in the forums that for this particular model of the iMac, i have to ensure that i buy the same model of the hard disk as what came in my machine originally. So i have figured that part out. I am thinking of getting a 2.0TB Seagate Barracuda XT.

Am i expected to run into any problems post upgrade?

I read somewhere that Apple has done some firmware upgrade which pretty much limits user options for disk upgrades. Result being, your FAN goes mad and runs at rull speed and etc etc..

Any and every feedback is useful.

Thank you.

Regards,