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How to change a hard drive in a powerbook G4?

This guide should work fine for you: PowerBook G4 Aluminum 15" 1-1.5 GHz Hard Drive Replacement

What size? If it’s a 12" the answer is here. http://tinyurl.com/yca8bsy For some reason the title of the page is wrong (it thinks it’s about changing a master password!) but the instructions are how to change the internal drive in a 12" powerbook. Cheers, Kwackman