HP has stuffed an insane amount of the server CPUs and memory components-plus-cooling in the front of the chassis to provide space in the rear. What was pushed out? The base prices for the machines reflect no drives. Yes, they can be installed in a Small Form Factor (SFF) cage inside. However, HP believes you probably won’t put many drives inside and the drives aren’t easily accessible from outside the chassis for hot swap anyway—the front is covered by the four aforementioned fans.