I found that I could only put two hard drives in my G5. However, there is not much need for more, now that the Hitachi 7K500 SATA drives are available. These are 500 GB drives of high quality. If you need more, you can add all of the FireWire 800 external drives you can afford. I have been using 3 of these that have been extremely reliable, and without any problem, as boot drives running OS X 10.4.2. George Harvey On Sep 13, 2005, Richard Gilmore wrote: > Haw many hard drives can I put in a Power Mac G5?