This may not be appropriate for your rig, but I'll stick my oar in, anyway.

I've got a Mac Pro with four internal bays. As hard drives reached the end of their warranty period, I would take them out of service and stick them on the shelf. I use them for backups of backups.

So, I bought a USB3 hard drive caddy. It has a slot that accommodates 2 1/2" and 3 1/2" drives. Very useful. Quite cheap.

There must be a USB-C version out there. (I assume that's what your iMac has?)


iMac (19,1, 3.1 GHz i5, 12.7.4, 40 Gb RAM); MacBook Air (1.8 Ghz, 8 Gb RAM, 10.14.6, 256 Gb SSD) Vodafone router and Devolo Wi-Fi Extender, Canon TS8351 printer/scanner.