What is the Apple Method of Making a DVD Copy of Leopard?

Read this: http://www.macmaps.com/bootcd.html

There is no "official Apple method" that I am aware of.

I'm not really sure what the difference is between Q1 and Q2. A Leopard install DVD is bootable but you can't do much else with it.

Leopard comes on a dual-layer DVD, so the question is: can your old G4 burn dual-layer DVDs?

... can your old G4 burn dual-layer DVDs?

FWIW I bought a replacement internal optical drive (a Matshita model though) for my similar vintage G4, running Tiger, and all the drive's functions worked including burning DVD+R DL.

Since the OP didn't indicate the external burner's brand though who knows:

Angel Llorente wrote:

... I have an external dual-layer DVD burner.

Its capabilities should appear in System Profiler.

Should work.

To be sure check your "About this Mac" > More Info...

Find Disc Burning on the left column. It should list its capabilities like so

OK, that's your internal one. It's not showing dual layer write capability. Try the System Profiler under FireWire. See if the disc burning capability appears there. It should say "DL" for dual layer, something like this:

Are you connecting your external DVD burner via USB or Firewire?

If via USB that's going to be a mighty slow burn for a QuickSilver.

Since your Firewire bus doesn't register your LaCie, it would seem logical either it is connected via USB, or it is not turned on, or it is not connected. To tell the difference, see this image:

These are the ports from an iBook G3 Firewire. They are as follows from left to right:

Modem, Ethernet, USB, Firweire, and Audio out. Make sure your LaCie is hooked up to a similar port on the back of your Mac as the Firewire one above.

It would appear from that picture that nothing is connected to your FireWire bus.

For what purpose do you want to make a duplicate DVD os Leopard OS 10.5?

No G4 tower Mac has USB 2. They are all USB 1.1. Furthermore few external drives will boot Mac OS X on a PowerPC via USB. Stick to Firewire until you are all migrated to Intel Macs. Firewire 800 has cables you can connect to 400 easily.

Angel Llorente wrote:

I want to make a backup copy of Leopard just in case something happened to my original Leopard DVD. I use USB 2.0 and Firewire 400.

Then try this:

http://docs.info.apple.com/article.html?path=Mac/10.5/en/8764.html

and

http://docs.info.apple.com/article.html?path=Mac/10.5/en/8398.html