how do i make a DVD ISO?

[bjork]

i have a dvd burner (well, my friend has one on his g4).

i tried just hitting "copy" on toast 5 titanium (for devil may cry), but it wouldn't boot.

i'm using neo 2.2 internal mod chip in conjunction with gameshark 2 v 1.3... all my CD-R backups work fine, but i've been burning those on my own PC...

the question:

does anybody know how to make an ISO of a DVD (preferrably on a mac (so i wouldn't have to do it on a HD then put that IN the mac to burn)? i used to use a lil app called "astarte cd-copy 1.3", but that was years ago, i dunno if it'll work for a dvd. i'm probably going to try that tomorrow, but if anybody knows a software solution that will work 'for sure', i'd love to know. DVD-Rs aren't cheap, and they make really expensive coasters.

thanks...