A:Answer There are mounting brackets inside of the case. You need to take the back panel off (you'll likely need a screwdriver, the thumbscrews are not very loose.) You would just need to put the drives in the bays for them, and plug them into the Sata ports on your motherboard. Warning though: I installed my hard drive into this PC and getting it plugged in was hard. The GPU was in the way, as well as the power supply cables.