Need to put a larger HD in Mac G4, easiest way to keep things as they are?

[ka jowct]

Buying an ATA controller makes a lot more sense then farking up a couple of 200GB drives by formatting them to 128GB (something you may not be able to undo later). $60-$80, possibly less if you get lucky on eBay.

I have a G4/450 with a pair of 120GB drives on the built-in ATA controller, and one 250GB SATA drive plus SATA card.

You also have the option of putting the 200GB drives into FW enclosures.