I don't know the dell line myself, but it may help a knowledgable Dell user if one comes across this thread. There will be only one drive. Not sure how Dell partitions it though.

You didn't say what you see on hda1 or what you are looking for. Could it be that you're looking for those damn hard to find directories like My Documents or My Pictures? They very well may be there, just a bitch to find the way Windows (and Xp in particular) hides things.