I looks like 24 bays vs 20 bays is obvious difference.
But I am unsure of the other small differences. I don't need more than 20 bays so I am leaning towards the 4220. Anything special or different between these two models?
But I am unsure of the other small differences. I don't need more than 20 bays so I am leaning towards the 4220. Anything special or different between these two models?





















