How To Upgrade/Replace Mid-2011 iMac 21.5" Hard Drive To an SSD! - YouTube
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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
iMac SSD-Upgrade für 21,5" und 27" Late 2009 bis Late 2011 | Apple SSD-Upgrade | Service | Level 16 Online-Shop
21.5 / 27 inch iMac (Mid 2011) HDD Ausbau gegen SSD (with subtitle) - YouTube
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2011 27" iMac SSD upgrade + fan speed - Whats the current consensus? | MacRumors Forums