SSD gives new 21.5-inch iMac signifcant speed boost | Macworld
Apple iMac 2011 (Mid) 21.5-inch (iMac 11,2) SSD ,Ram & OSX Upgrades - ZD Laptop Service Centre
Install SSD iMac 2011 - How-To DIY Guide Tutorial
OWC SSD Upgrade Kits For 21.5-Inch iMac 2011
Optical Bay Hard Drive or SSD Mounting Solution for iMac
How to: Install an Intel iMac Dual Hard Drive Kit 21.5" (Mid 2011) - YouTube
Amazon.com: OWC SSD Upgrade Kit for 2011 21.5-inch iMacs, Mercury Electra 2.0TB 6G SSD, 18" SATA III 6Gbps Data Cable, Installation Tools and iMac Screen Adhesive Tape Set : Electronics