On Jan 28, 2010, at 10:50 AM, Bruce Johnson wrote:

In fact it won't work on a PPC mac, you need to format it as a Apple Partition Map partition.

I've booted GUID on PPC Macs myself, so I know that GUID will boot on PPC Macs. For that matter, GUID is required if you want an external boot drive that can boot both Intel Macs & PPC Macs. This requires Leopard since it's the only "universal" version of OS X that will boot both PPC & x86. There are plenty of reports on the internet of PPC Macs booting GUID, here's my "I'm Feeling Lucky" hit, but there are more:

<http://forums.macrumors.com/showthread.php?t=376686>

Also, PC Hackintosh used to be "Master Boot Record" scheme only, but now GUID is the preferred scheme for booting a PC Hackintosh. With Leopard you could possibly have an external HD that would boot OS X on PPC Mac, Intel Mac, and Hackintosh; a truly "universal" boot disk.



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