I installed this on a 2012 27" iMac. As soon as you access the hard drive it shows up immediately. Of course you need an adapter to use it, but this is an Apple design feature It's been up for a few months now and I'm very happy with it so far, I've gone from 256GB to 1TB and won't look back.
Kingston A400 240GB SATA SA400S37/240G solid state drive
60 Review
ADATA SU800 256GB SSD: High Speed Read & Write, 3D-NAND, SATA III, 560MB/s & 520MB/s
27 Review
Crucial BX500 480GB SATA Internal SSD πΎ with 3D NAND Technology, Up to 540MB/s - CT480BX500SSD1Z
51 Review
SAMSUNG 860 EVO 1TB Internal SSD (MZ-76E1T0E), 2.5-Inch SATA III, 1 TB Capacity
29 Review
π½ High-Capacity WD 5TB My Passport Ultra for Mac Silver Portable External Hard Drive with USB-C and USB 3.1 Compatibility
10 Review
WD 4TB My Passport Portable External Hard Drive - USB 3.0 - Black (WDBYFT0040BBK-WESN)
6 Review
πΎ Buffalo MiniStation 2TB - USB 3.0 Portable Hard Drive: Reliable and High-Speed Storage Solution (HD-PCF2.0U3BD)
9 Review
π½ 2TB My Passport for Mac USB 3.0 External Hard Drive (Midnight Blue) with Protective Case (Navy Blue)
5 Review