PowerPC G4? What's that suppose to mean? iMac G4? Mac Mini G4? Power
Mac G4?
PowerPC is the name of the processor.
Regardless of which Power
Mac G4 you have, you need
an adapter for SATA drives.
Now, if you have this one (Graphite PCI-Graphics, AGP-Graphics, Gigabit-Ethernet, Digital Audio, or Quicksilver with GeForce 2 MX graphics):
Get a
160GB drive, because it can't handle anything beyond 128GB. You can only use 128GB of it, the other 32GB are unusable.
If you have however this one (Quicksilver 2002, 2002ED)
WITHOUT Geforce 2 MX graphics
or this one (Mirrored Door Drives (MDD))
OR want to spend additional $63 on the
PCI-SATA-Card rather then $15 for the adapter:
Get a
1TB hard drive, or even 1.5-2TB if you want to spend more money. The slower spinning eco-drives are fine for a PowerMac G4, and cheaper.
You may want some
Anti-Vibrations screws, too. In my PowerMac, the noisiest part is the hard drive.