Hard disk replacement for a mid-2011 iMac - Life, the Universe and Fishing
How to Upgrade iMac Hard Drive (2009, 2010, 2011): EveryMac.com
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
iFixit Offers Kit To Install 2nd Hard Drive in Mid-2011 iMacs - MacRumors
Juicy Crumb - 2011 27" iMac Upgrade Logic Board by Juicy Crumb Systems — Kickstarter