On certain iMac models the Apple hard drive has a built in temperature sensor which is specific to that particular model. It is not necessary to use an Apple labelled drive however as a generic replacement of identical quality and functionality can be used with a much smaller price tag. Should the inevitable failure of the drive occur to you, it is alarmingly expensive to replace it with an original Apple drive. The situation is not helped by ingress of dust into the extensive cooling system so a top tip is to have your iMac stripped and cleaned once a year. This heat is a big enemy of hard drives and will cause earlier failure than is normal. A really common problem on iMacs unfortunately as a large amount of heat is generated inside that nice sleek aluminium housing.
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