https://lowendmac.com/2005/how-big-hard-drive-imac-emac-power-mac-powerbook-ibook/

Older IDE specifications made no provision for what have since come to be called “big drives” – those with over 128 GB of storage space. Big drives need 48-bit addressing, and almost all Macs built before 2002 don’t have built-in support for it.

[…]

Original Power Mac G4Macs that don’t include big drive support include tray-loading iMacs, slot-loading iMacs, beige G3s, blue & white G3s, Yikes! G4s, Sawtooth (a.k.a. AGP) G4s, Digital Audio G4s, and Cubes. On the notebook side, no G3 PowerBooks or iBooks support big drives. Neither do the first Titanium PowerBook G4 models (the ones with VGA output), although TiBooks with DVI output do.

Big drives are only supported under OS X 10.2 Jaguar and later in iMac G4s, eMacs, 2001 Quicksilver G4s,* 2002 Quicksilvers, and all later desktop Macs. All Titanium PowerBook G4 models with DVI video and all 15″ and 17″ Aluminum PowerBooks support big drives.

Größere Laufwerke gehen, dann sind aber nur die ersten 128 GB nutzbar.