Hi-
Welcome to Discussions!
Knowing the specific model of your "old silver G4" would be very helpful, as, for now, only general statements can be made......
Any G4 can have up to 4 internal hard drives, up to 2 hard drives are supported without additional controllers cards.
So, yes, it is very easy to add one more hard drive to your interior. All cables are there, just put the drive in, connect the cables, format with Disk Utility and go.
Depending on the G4 model, you may be limited to 128gb hard drive. Others have no size limit.
Depending on your G4, the drives need to be jumpered either Master/Slave, or Cable Select.
Adding a PCI controller card will allow any machine to use large hard drives, and allow support for up to 4 drives in the tower.
For ATA drives, the Seagate Barracuda drives are cool, quiet, and very reliable. Most recommended.
As for the USB 2.0 PCI card, brand is not as important as chipset. Any brand, with a *NEC chipset* will provide the best results. Avoid Via and Ali chipsets. They are problematic.
My Ratoc works
very well.
This is a list of known trouble free NEC chipset USB 2.0 PCI cards:
Adaptec 3100LP
BAFO BF-460
Belkin F5U220
GWC UC-160
IOGear GIC250U
Keyspan U2PCI-5
O'toLink U2-C2B
O'toLink U2-C2A
O'toLink UF-P43
O'toLink U2-P20N
O'toLink U2-P50
Ratoc PCIU5
USBWholesale UII-PCIP
Note, that there can be sleep issues with certain devices connected to USB 2.0 PCI cards, mainly hard drives. Best to avoid USB 2.0 external hard drives. For external hard drives, use firewire.
See
Xlr8yourMac for user reports with various cards.
