At the top of the front of the case is a spring loaded door, that when pressed, flips open and exposes the I/O ports. The Obsidian 650D boasts quite a collection here and is probably the widest variety of ports that I've seen, as it includes just about all standard ones with the exception of eSATA. Behind this door are two USB3.0 ports, two USB2.0 ports, audio jacks, and a Firewire port. I have seen very few cases that offer front Firewire capability. Of course, 98% of us won't use it, but the 2% that do will be very happy about it. That's just Corsair covering all its bases. Right behind the I/O ports on the top is the hard drive dock. It will accept 3.5" and 2.5" drives. For 2.5" drives, there is even a spring-loaded tab that holds it in place.