How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
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
Install 3 hard drives on iMac 2011 27" FAILED ... | MacRumors Forums
Further Explained: Apple's iMac 2011 Model Hard Drive 'Restrictions'