“The two models, the 30TB … and the 32TB …, each offer a minimum of 3TB per disk”. Well, yes, I would hope something advertised as being 30TB would offer at least 3TB. Am I misreading this sentence somehow?

Answer wrong. The more of us humans that answer wrong, the less accurate we need to be to get past these stupid things. If google want me to do work for them, they can pay me.