How do you add a second internal harddrive to a G3 iBook?

I have a G3 iBook with a 10 GB HD, and would like to add a harddrive in addition to the one already in it.

Can't be done. There's no room for a second drive.Your only option is to take out the original and put in a larger one. If you need files off the old one, get an external HD enclosure, put it in there, and use it as an external.Works fine. I've done it.