Reply to Questions about Serato DJ Intro and Usb Sticks.

I don't have a controller yet and I am using Serato DJ intro on my laptop in the one deck mode since you need to plug in hardware to able to to use two decks. But I noticed that when I have a usb stick plugged into my computer that has songs on it there ins't anything on serato DJ intro that allows me to click on it and use the songs from it. Is this because I need hardware?