Amazon.com: OWC SSD Upgrade Kit for 2010 27-inch iMacs, Mercury Electra 1.0TB 6G SSD, 18" SATA III 6Gbps Data Cable, SSD Power Cable, Installation Tools and iMac Screen Adhesive Tape Set :
Installing additional SSD in Mid-2010 27" iMac
OWC SSD Upgrade Kits for 27-Inch iMac 2010
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OWC 2.0TB HDD Upgrade Kit Compatible With 2009-2010 iMacs, Includes: Thermal Sensor, Tools, 2.0TB Hard Drive : Electronics - Amazon.com