Opened up 2012 21.5 iMac for SSD upgrade. | MacRumors Forums
Apple iMac SSD Upgrade — Epoch Business IT Solution
🍏🖥️🛠️ 21.5" iMac Hard Drive Replacement or SSD Upgrade 2012-2017 (Including Retina) A1418 - YouTube
Amazon.com: OWC 2.0TB SSD Upgrade Kit for 2011 21.5-inch iMacs, 2.0TB 6G SSD, 18" SATA III 6Gbps Data Cable, Installation Tools and iMac Screen Adhesive Tape Set : Electronics