1. He only need a long-lasting disk for OS and some low-resource activities (with that much space and adequate RAM you're good to go)
2. Seeing how Oliver have THIS large hentai collection, I'd assume he have a special disk for data storage.

If you see from a plain sight though, yeah "upgrading" from 400GB to 64GB is kind of... indecent.

I'm not too fond of pubes, so this one really catch my interest

Erm... moar H without pubes?xD