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I think it depends on the model of G4

ya, "older (Pre-Mirrored Door) G4 and G3 Macintoshes -- including Cubes, PowerMacs, PowerBooks, iBooks eMacs and iMacs" "Later model G4's and all G5's and Intel Macs do not suffer from this limitation."
 
Does the power mac g4 have the 128 gb hard drive limit? if it does how do i get around it


Just buy yourself an external firewire 400 HD and just run your G4 from your external 1 TB hard drive. Or smaller if you like.

I have a G4 466 DA (internal limited to 128 G) and I have a 250 G firewire hard drive attached to it. On new updates, I switch to the external drive and run all new update on it first. If the updates works fine, then I start up again on my internal drive and download the updates.
 
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