I ran into that as well.

My understanding is that only an APM partitioned drive can boot both PPC and Intel Macs. Apparently, it's not possible to create a universal boot drive from an Intel Mac.

Has anyone tried an upgrade on a PPC machine, and successfully booted an Intel Mac? Theoretically, that should work.

Of course, that doesn't help for an APM drive in an Intel machine. You couldn't move it to a PPC box to do the upgrade because it the Tiger system wouldn't be a valid boot drive on that system.

I'm currently using Leopard on a GUID partitioned drive, with my user directory on my the old APM drive with Leopard on it. I set the user directory by right-clicking on my account, and changing the location (and, in my case, user and group IDs) there.

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> "Apparently, it's not possible to create a universal boot drive from an Intel Mac."

Not so. I just cloned my Leopard installation DVD onto an 8 GB APM partition from my CoreDuo Mac Mini running 10.5 in Disk Utility. That 8 GB APM partition now works perfectly to boot our CoreDuo Mini and our G4 machines, too. Leopard's DVD has special boot properties, as does DiskWarrior 4.0 CD. By contrast, cloning our CoreDuo Mini's hard drive to an APM volume with CCC resulted in a volume that won't boot past the white Apple screen.

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