After replacing the hard drive in my 2009 iMac 27", I noticed that the hard drive fan spins at maximum speed since the sensor cable is not plugged in. (The new SSD drive doesn't support it)
To solve this issue, I installed a software called "Macs Fan Control" that can read out the temperature from the SMART status of the drive and control the fan speed itself.
This was a near-perfect solution until I upgrade my system to macOS Sierra. Now both "Macs Fan Control" and also "smcFanControl" can't control the fans anymore and the latter reports that I am running it on an unsupported system.
Now my question is, can I somehow control the fan speed manually using Terminal etc. or do I have to "trick" the sensor hardware-wise?