Can't boot from ISO

[RobinS]

I want to create some diagnostic discs and presume I should be burning them in ISO format. Also I want to make a copy of my valuable install DVD. I tried with ISO since I thought that was a direct copy but OS X won't boot from it. I'm using an external firewire DVD burner. Other stuff burnt on it is fine. Can you boot from an ISO in OS X?

 

[Giaguara]

Those discs need to be made bootable. If I remember correctly, e.g Toast allows this.

 

[ElDiabloConCaca]

Do you mean boot directly from an ISO? Or do you mean use an ISO image to burn a CD or DVD, then boot from the burned CD/DVD?