NVMe SSD Upgrade on a Late 2012 iMac | MacRumors Forums
You won't be adding an aftermarket SSD to your new iMac | Ars Technica
SSD For Macbook 512GB 1TB 2013 2014 2015 Pro Retina A1502 A1398 iMac A1418 A1419 SSD Macbook Air A1465 A1466 Solid State Drive
iMac 2012 internal storage upgrade
Amazon.com: GODSHARK 7+17 pin mSATA to A1398 A1425 (2012 & Early 2013) Adapter for MacBook Pro Retina SSD Replacement, Mini PCIe SATA SSD Converter Card : Electronics
Installing SSD on iMac iMac, 27 inch, late 2012 3.4ghz | MacRumors Forums
How to Install/Upgrade the SSD Card Slot of a 27-inch iMac (Late 2012) on Vimeo
21.5" iMac Hard Drive SSD Upgrade or old drive replacement 2012-2017 (Including Retina) in 4k - YouTube