The iPad Camera Connection Kit may be selling itself short with its name; turns out you can also use it to hook your iPad up to an external hard drive. Here's how it's done.
The video above, from Maxwell Shay, walks you through part of the process. It only works after you jailbreak your iPad, something we wholeheartedly recommend you do anyway. Once you've done that, download the iFile app and the Nano terminal text editor from Cydia. That's the easy part.