Aiport Extreme Compatibility

Last night I bought the previous model Airport Extreme (802.11g) off craigslist. I thought it would be a great way to create a small home office network using an external usb hard drive. Come to find out, it doesn't support usb external hard drives, only ethernet.

I found some usb-to-ethernet converters online, but I was wondering if someone could tell me if this will work or not. Anyone have any experiences with this or similar?

Thanks, all.

Ryan