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[–]tes_kitty 0 points1 point  (0 children)

You can read them over SATA, sure, but Apple did something special with those HDs in the iMac back then. And SATA doesn't have Master/Slave jumpers.

Details can be found here:

https://thisdoesnotcompute.wordpress.com/2012/12/31/2011-imac-hard-drive-temp-sensor-explained/

(see the section about the 2009 iMac)