I heard that it isn't possible to change the harddrive in the new iMacs by myself anymore. Only Apple can do this for an unbelievable horrible fee.

The German "Gravis"-Store can fix this a little cheaper. They build a special electronic-part called "cBreeze" (fan controll system) to fix this "problem".

They install "some" 2TB HD with this"cBreeze" - for 199 Euro!

Does anybody know how an iMac-2011-user can change the harddrive a little bit cheaper?

Or rather - how can I recreate such a required "fan controll" by my self?

Thanks in advance