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Original post by: Flying Dutchman ,


Modern HDDs are not compatible with your G4, since these days all standard HDDs are fitted with a SATA interface, and the G4 uses the IDE/PATA interface for HDDs and ODDs.

New PATA HDDs (old stock) are still available however, in capacities up to 500GB or so, but I'm not sure if the G4 can handle HDDs larger than 120GB.

If I remember correctly, Apple used IBM/Hitachi HDDs with custom firmware for lower noise, but standard PATA HDDs should work.