Apple changed to a seven lead temperature sensor and proprietary firmware in their hard drives in late 2009. Their thinking appears to be that no one but Apple or an Authorized Service Provider has the ability to change a hard drive. So you have to go through Apple to get a drive that won't make the fans run at full speed. To date, I have seen no work around on this site or any other to get around this. Thus you are at the mercy of Apple on pricing. I do expect to see a class action law suit on this soon but who knows when and it doesn't help you now. I would contact Apple to see if they will help you at all. Please let us know your results.