Recently I got to know, A new temperature sensor system is implemented by Apple on its latest iMac models. And after this, in case of failure of hard drives, users will not be able to replace their original hard drives even if they desire to upgrade it. This all is because, Apple has changed the SATA power connector from 4 pin to a 7- pin power configuration and the temperature of Hard drive is regulated by this cable and a firmware of Apple. As this firmware reside on hard drive itself, if we remove it causes fan to spin at maximum speed and replacing it with any non-Apple original drive will result in failing the Apple Hardware Test.
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