Hi - hope this is the right heading for my question. I have an old PowerBook G4 1.5GHz with 80 GB hard drive that is getting full (I have 25GB free after some housekeeping). I know I can buy an external Firewire HDD, and I have one already for Time Machine. I am keen on replacing my HDD with something bigger. Will any 2.5" ide fit or does it have to be of a specific make/dimensions etc? Also, is there a maximum that these laptops can support? I can get a 160GB for under £50 or a 250GB for under £75. and no, I do not have any qualms opening up the laptop. Thank you in advance.