I've got no experiece with the PC side of your problem, but does your iBook recognize the drive when it's plugged in? I'm assuming your running OS X. Plug in and turn on your DVD drive and go to your System Profiler (Apple Menu-About this Mac-More Info. Look under Hardware for the USB listing, everything that's plugged in via USB should show up. The drive might not be supported on the Mac, the System Profiler should tell you if it is or not. If not, go to
www.patchburn.de and download their app. It's shareware but you don't have to pay to use it (although I suggest you do, it's an amazing little app). I replaced the CD-RW in my G4 with an unsupported Sony Combo drive and patchburn got everything working like a charm.