Cache SSD: Samsung 850 Evo 500GB (random one I had kicking around)
Hard Drives: 4x12TB IronWolf Pro + 2x8TB Seagate Barracuda + 2x4TB Seagate Barracuda + 1x4TB WD Black (these are all random HDDs I've collected over time)
And I'm running Unraid for the OS as I have a mishmash of drives, and don't need it to be super fast or anything.