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Upgrading your hard drive is probably something you will investigate after purchasing your new TiBook. With stock configurations shipping with 10 and 20 GB hard drives (in the 400 and 500 MHz models respectively) anyone doing extensive multimedia or video work, and Napster addicts with broadband, will need more storage.
Read more: Titanium: Installing a Hard Drive.
If you are also planning to install an Airport card, it is a good idea to do it at the same time while the bottom cover is off. Visit Titanium: Installing an Airport Card for complete step-by-step photos and instructions.