iFixit Offers Kit To Install 2nd Hard Drive in Mid-2011 iMacs - MacRumors
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How To Upgrade/Replace Mid-2011 iMac 21.5" Hard Drive To an SSD! - YouTube
2011 iMacs Make It Impossible For You To Upgrade Your Own Main Hard Drive | Cult of Mac
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Hard disk replacement for a mid-2011 iMac - Life, the Universe and Fishing
Hard disk replacement for a mid-2011 iMac - Life, the Universe and Fishing
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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