USB Port*: Apple iMac 21.5-inch 2.5GHz Quad-core i5 (Mid 2011) MC309LL/A | mac of all trades
Identify the ports on your Mac - Apple Support
How to add a iMac USB Port in the front! Aukey HUB & Adapter REVIEW - YouTube
iMac Intel 21.5" EMC 2428 Teardown - iFixit
Supercharge Yourself with the New Thunderbolt-Equipped Quad-Core iMac | B&H eXplora
iMac "Core i5" 2.5 21.5" (Mid-2011) Specs (Mid-2011, MC309LL/A, iMac12,1, A1311, 2428): EveryMac.com
Apple iMac 21.5" All-in-One Desktop Computer i5-2500s 2.7GHz 8GB Ram 1TB Mac OS High Sierra MC812LL/A w/ Keyboard & Mouse
Identify your iMac model - Apple Support
20 Terms Every Mac User Should Know - Administrivia
21.5- and 27-inch iMacs (Mid 2011) | Macworld
USB-C and Thunderbolt: Understanding Ports and Cables for Macs and iPads - The Mac Security Blog
iMac (21.5-inch, Mid 2011) - Technical Specifications
Amazon.com: SABRENT 4-Port USB 3.0 Hub for iMac Slim Uni-Body (HB-IMCU) : Electronics
Adding USB3.0 to late 2009 iMac (11,1) | MacRumors Forums
USB 3.0 for iMac mid 2011 | MacRumors Forums
USB 3.0 for iMac mid 2011 | MacRumors Forums
Apple updates iMacs with Sandy Bridge processors, Thunderbolt ports, FaceTime HD camera and more - 9to5Mac
Amazon.com: SABRENT 4-Port USB 3.0 Hub for iMac Slim Uni-Body (HB-IMCU) : Electronics
Apple updates iMacs with Sandy Bridge processors, Thunderbolt ports, FaceTime HD camera and more - 9to5Mac
Amazon.com: Mini DisplayPort to HDMI Adapter for iMac Mid 2011(27-inch, 21.5 inches) Mini DP (Thunderbolt) to HDMI Adapter Compatible with MacBook Air/Pro, Microsoft Surface Pro/Dock, Projector and More 1-Pack : Electronics
The 27-inch Apple iMac Review (2011)
USB 3.0 for iMac mid 2011 | MacRumors Forums
