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How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
Amazon.com: OWC Data Doubler Kit for 2009-2011 iMac, OWC 250GB 3G SSD with Mounting Solution and Toolkit : Electronics
OWC Internal SSD DIY Kit For All Apple 21.5" iMac 2011 Models w/ Tools : Electronics