Hard drive fan noise. iMac mid 2010. I tried to isolate the sound the best I could. : r/applehelp
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iMac Intel 21.5" EMC 2389 Hard Drive Fan Replacement - iFixit Repair Guide
2011 imac 27" 32GB - final stage of 1TB + 2TB SSD upgrade (replaced HDD & optic drive). Also cleaned out the fans and case. Running 'SSD Fan Control' & 'Macs Fan
Installation d'un second disque dans l'iMac Intel 21,5" EMC 2428 - Tutoriel de réparation iFixit
OWC DIY Kit for all Apple iMac 2011 for replacing the main hard drive
iMac Intel 21.5" and 27" (Mid 2011) SSD Temperature Sensor - iFixit Store
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Fan Noise After Adding SSD To Mid-2011 27" iMac | MacRumors Forums
How to properly set SSD Fan Control on iM… - Apple Community
HD Upgrade Kit for all iMac late 2009 - mid 2010 Models - 34.60EUR - OWCshop