We would only recommend changing settings if you have a drive for which they are not suitable, or you wish to have the fan running more, or less than the defaults provide.

What you are generally trying to achieve is to reach the max fan speed of 6000rpm, about 5C below the max operating temperature for your drive.

For when the fan starts to increase we would recommend setting this about 5-10C above normal idle HDD temperature.

The fan has a hardware low limit of 1000rpm, and cannot go slower than this, for most users this should be the setting you use.

You may want to increase this to provide extra constant cooling to your drive, but note this will increase the fan noise.

Thus providing the maximum cooling it can, this should be below the maximum operating temperature for your drive.

Fan management in Apple systems relies on temperatures reported by the SMC system.

The SMC collects data from external sensors or by reading the internal hard disk temperature in a proprietary manner.

In both cases the SMC system tends to go into frenzy and drive you mad with a loud fan.

The core of the system is a daemon that runs in the background and takes care of the fan management.

Whenever the SMC system resets to its default, SSD Fan Control takes over again to make sure that your system remains quiet.

Aside of this daemon, SSD Fan Control features a user-friendly application for monitoring and control.

Mac Fan Control Settings For Sdd