I wondered this too. I called Apple earlier and the guy said Apple could certainly upgrade the HDD but the max. they could put in my iMac was 320GB 😱
To be honest though, I could barely hear him. He said all I had to do was take my iMac into an Apple store and they would arrange the upgrade. Is this true, is it really that simply and how much do they roughly charge??
I really could do with a 1TB but do not fancy doing it myself!!