YOU DO NOT NEED TO MODIFY BOTH ENDS, BUT NO PROBLEMS WILL BE CAUSED BY BOTH MODIFICATIONS BEING IN PLACE. On 2010- 2011 iMacs you can either modify the drive you'll be installing -OR- the logic board itself. You could also simply add a jumper between the two pins of J5400 on the logic board itself.
The best solution is to simply snip the hard drive terminal off of the cable and strip and solder the two wires together. On 2009 iMacs, there is a separate two-wire cable that runs from the logic board to the hard drive and connects to J5400 on the logic board. If you connect HDD_OOB_TEMP_FILT to ground, the thermal trigger never occurs and the system will behave as it normally would with its OEM drive installed. There is no such thing as HDD thermal sensor on iMacs from 2010 or 2011 - instead it's simply a thermal trigger sent by the OEM-installed hard drives. These can be controlled by software like MacsFanControl or smcFanControl, but that's a poor workaround for an issue that can be addressed internally quite easily.
If you replace an OEM drive in a 2010 or 2011 iMac, the fans in the system will go crazy.
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