A few points: I just replaced a HD in an iMac and saw that sensor cable. What do you think the chance is that I put it back in the right spot (on the new, diffe

A few points: I just replaced a HD in an iMac and saw that sensor cable. What do you think the chance is that I put it back in the right spot (on the new, different drive)? The failure mode for a temp controlled fan should always be full on. Macs from #1, Plus, SE all the way to the current models have been unique and required some special tools. Anyone who takes apart Mac has a full set of Torqx bits. I don't see much difference between a case splitter and a suction cup. My guess as to the new sensor is that it is better than the ones inside the drive. Or measures what matters, like external drive temp (just guessing). Apple has had their own firmware on drives forever. This has only precluded upgrades, etc. In a few cases and usually for good reason. So, I think this is like any advance. I hope I'm right.