iBook G4, 1.07Ghz, 27.82GB HD, OS X Tiger. It has been discovered, through trying to up-grade to Tiger, that the HD is bad, so it needs to be replaced. As we've nearly 70% filled it we'd like to install a bigger one, so the question is: What is the biggest HD this will take? If I've not provided enough information please let me know what else you need to know. Because I don't want to buy an HD that is not going to be recognised I'd be grateful if you could support any suggestions with web-links, and, therefore links or pointers to relevant web-sites will also be gratefully received. Thank you for your time.