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Message: <blockquote data-quote="chscag" data-source="post: 1627697" data-attributes="member: 46727">If you have a Mid 2010 iMac, it doesn't matter whether it's SATA 1, 2, or 3 as the hard drive will fall back to whatever speed your iMac can generate.  What matters, however, is that your 2010 iMac needs some special consideration since the heat sensor cable is designed for whichever hard drive is currently in the machine.  You should replace the drive with the same type or the hard drive fan may run full speed.There are quite a few articles about replacing the hard drive in your model iMac. Do some Googling and make sure you understand all the technical aspects of undertaking the job yourself.</blockquote>