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Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
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Best USB 3/USB-C Hubs for Aluminum iMac Tapered Edge: EveryMac.com
iMac (21.5-inch, Mid 2011) - Technical Specifications
iMac (27-inch, Late 2012) - Technical Specifications
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
Sabrent Premium 4-Port USB 3.0 Hub for iMac (2012 and later)
Guide to Mac, iPad, iPhone ports: Lightning, USB-C, Thunderbolt & more | Macworld
