I'm a newbie also, sorta.
Try an external hard drive with USB
If you're using the original Sharp ROM, I don't know if this works as below. I use Cacko.
If your'e running Cacko, and are using the correct cable/adapter, you should see a new source in the "Files" tab. This is the last tab in qtopia. Also you should get an onscreen message that says "Updating information" about 2 secs after you plug in the hard drive.
If you hard drive uses external power, make sure it's activated.
This is what I get in my files tab on my C3100
Storage /dev/sda1
I have an external hard drive enclosure with an old EIDE drive inside it. It takes an AC adapter. As soon as I turn it on, and plug it into my Zaurus, I have an additional drive on my Zaurus.
Jon