I replaced my internal drive with a SSD and the hard drive fan is currently running at 5000rpm due to the fact that she's not getting the correct information from the HD sensor.

Is there's a way that I can disable the sensor OR set a manual value for the fan speed?

Thank you

What most people do in that case is short the sensor cable with a pin and tape it up. It's not ideal but I can speak from experience that it does work.

You might also be able to purchase a heat sensor like they use on the optical drive and replace the hard drive one with that but you'd have to make sure you got the right part number etc.

Option C would be to install a fan control app that would limit the speed for the fan.

Google will return you a ton of threads on this topic

I installed 2 different apps (smcfancontrol and imac fan control) and the only thing they allow me to do is set the minimum fan speed, not the fan speed itself.

I came across this on the Apple site and wonder if it might not help your situation as it does refer to fans running too fast?

Intel-based Macs: Resetting the System Management Controller (SMC) (http://support.apple.com/kb/HT3964?viewlocale=en_US)

I came across this on the Apple site and wonder if it might not help your situation as it does refer to fans running too fast?

Intel-based Macs: Resetting the System Management Controller (SMC) (http://support.apple.com/kb/HT3964?viewlocale=en_US)

Thanks... already did this.

I just grabbed one of these, as I'm replacing the HDD in my iMac as well - https://www.applecomponents.com/items/0000004398/cable-temp-sensor-optical/?pn=1

Replaces the cable that used to read your drives built-in temp sensor with an external temp sensor (like the 2008 models had)... Apparently it works like a charm - according to several forum posts. At $20 it's not a huge gamble one way or the other.

I ordered a caddy to install my SSD in the optical bay, I shouldn't need to worry about this right?

If I'm not mistaken the Optical drive still uses an external heat sensor, so you should be fine - perhaps others can verify this info me?

I installed 2 different apps (smcfancontrol and imac fan control) and the only thing they allow me to do is set the minimum fan speed, not the fan speed itself.

Hey, to control the fan speed when you have replaced the drive, in relation to its temperature (reported using S.M.A.R.T, not the temp sensor) you can use the software at www.hddfancontrol.com (http://www.hddfancontrol.com). It was created specifically for this issue. Its been working great for me.

I just grabbed one of these, as I'm replacing the HDD in my iMac as well - https://www.applecomponents.com/items/0000004398/cable-temp-sensor-optical/?pn=1

Replaces the cable that used to read your drives built-in temp sensor with an external temp sensor (like the 2008 models had)... Apparently it works like a charm - according to several forum posts. At $20 it's not a huge gamble one way or the other.

make sure you post back to let us know how it goes.

[QUOTEshort the sensor cable with a pin and tape it up[/QUOTE] Can you be more specific please maybe with a pic.Thanks

There's not much to say really...there's two "holes" on the cable...just use a small piece of metal bent into a "U" shape to short those two pins and then cover it with tape. Do a google search as it is a common issue and I remember seeing a few threads on it with photo's.

There's not much to say really...there's two "holes" on the cable...just use a small piece of metal bent into a "U" shape to short those two pins and then cover it with tape. Do a google search as it is a common issue and I remember seeing a few threads on it with photo's. or just cut the wires join them and tape them.OK thanks you very much for you immediate answer i appreciate it.