Further Explained: Apple's iMac 2011 Model Hard Drive 'Restrictions'
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
Apple Restricts Hard Drive Replacements on New iMacs - MacRumors
2011 iMacs Make It Impossible For You To Upgrade Your Own Main Hard Drive | Cult of Mac
OWC In-Line Digital Thermal Sensor HDD Upgrade OWCDIDIMACHDD11
OWC goes in-depth on iMac 2011 hard drives
Amazon.com: OWC SSD Upgrade Bundle for 2011 iMacs, Mercury Electra 250GB 6G SSD, AdaptaDrive 2.5" to 3.5" Drive Converter Bracket, in-line Digital Thermal Sensor Cable, Installation Tools, (OWCKITIM11HE250) : Electronics
Amazon.com: OWC 2.0TB HDD Upgrade Kit for All 2011 iMac Models
How to Upgrade iMac Hard Drive (2009, 2010, 2011): EveryMac.com
SSD only vs HDD+SSD on iMac A1311? | MacRumors Forums