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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
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Amazon.com: iFixit SSD Upgrade Kit Compatible with iMac Intel 21.5" (Late 2012-2019) - 500 GB : Electronics
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9to5Mac on Twitter: "iFixit offers $300 32GB RAM upgrade kit for latest 21.5-inch iMac, says SSD upgrades coming soon https://t.co/RUcNt2fSfl https://t.co/fYAvu8m2vA" / Twitter
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Upgrading a 27-inch iMac 5K to 14 terabytes - Replacing the Fusion Drive with both a SSD and an harddisk
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