How do I access/view my external HD on my computer through my airport extreme?

My external hard drive is connected to the USB port of my Airport Extreme and I can see it in Airport Disks pane in Airport Utilities. My question is, "How do I access and view the files from my mac and pc?"

Try one of these tips AirPort: How to mount an AirPort Extreme USB hard disk volume in Mac OS X and Windows. Which is easiest will depend a bit on your situation and what you want to do. with My Time Capsule it is as simple as double clicking eh drive and it shows me a folder for each drive.