OWC DIY Kit for 2011 iMac's factory HDD: 500GB... at MacSales.com
21.5 / 27 inch iMac (Mid 2011) HDD Ausbau gegen SSD (with subtitle) - YouTube
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