Using AirPort extreme with printer and hard drive?

Hey everyone I have an Airport Extreme the newest one. I connect my printer with USB and it works great over the network. If I switch and connect my 2.5" USB hard drive to it it also works. However if I connect a hub (powered) and connect both, only the printer works, the hard drive doesn't really do anything. I'd prefer to use a desktop hard drive, which I have, so I was going to buy a SATA to usb enclosure that also has external power, but is there something I should look for? Any reason that it wouldn't work with my current drive? Just don't want to buy an enclosure and have it do the same thing.