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How to Install a 2.5-inch SSD in the SSD Drive Bay of a 27-inch iMac Mid 2011 (Updated) - YouTube
iFixit Offers Kit To Install 2nd Hard Drive in Mid-2011 iMacs - MacRumors
Internal SSD Cable Upgrade Kit for Apple 21.5 Inch iMac 2011 Models | eBay
Amazon.com: OWC SSD Upgrade Kit for 2011 21.5-inch iMacs, Mercury Electra 250GB 6G SSD, 18" SATA III 6Gbps Data Cable, Installation Tools and iMac Screen Adhesive Tape Set : Electronics