To sum up:
For reasons of both speed and maximum disk size limits, the large drive options for a G3 tower/early G4 are
1) PCI IDE (ATA-100) interface card and internal Parallel ATA (IDE) hard drive
Pro: Inexpensive, fast
Con: Parallel IDE drive will not transfer natively to a G5. Could go into a FW case later however.
2) PCI SATA (SATA-150) interface card and internal Serial ATA hard drive
Pro: Marginally faster than Parallel ATA, drive can be transferred to a G5
Cons: Card is more expensive, drive is a bit more expensive. Drive will not fit into existing Firewire cases.
3) External Firewire case and Parallel ATA hard drive
Pro: Portable between machines. Can be turned off when not needed. Price about the same as the card+drive combos.
Con: FireWire 400 transfer speeds considerably slower than either internal solution.
4) Firewire 800 PCI interface card, Firewire 800 case and IDE hard drive
Pros: Portable and nearly as fast as an internal drive
Cons: Expensive
5) External case and Serial ATA hard drive coupled with a Serial ATA interface card.
Pro: Fastest external solution
Cons: Expensive, immature technology, no cabling standards established yet.
When purchasing drives, you may see the exact same drive model, one with a one year warranty and one with a three year warranty for $10 - $20 extra. Choose the longer warranty. Make sure you have the warranty terms in writing before purchasing.
The G3 B&W and G4 "Yikes" motheboard (PCI graphics) machines are limited to 256 Mb PC100 RAM modules (although you can install PC133 they must be 16-chip modules, generic PC133 8-chip units will not work).
Thanks
Trevor
CanadaRAM.com