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  #1  
Old 01-06-2009, 09:26 PM
howlinhill howlinhill is offline
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Bootable backups for 2 different Mac computers on one external hard drive?

I want use SuperDuper to make bootable back ups onto an external hard drive for both of my computers, (12" Powerbook 1 GHz and a 17" MacBook Pro 2.33 GHz), and I'm wondering if this can be done to one hard drive, but am guessing not because one is a PowerPC-based Mac and the other an Intel based Mac, thus requiring an Apple Partition Map for the 12" as well as a GUID Partition Table for the 17", (if I am understanding it correctly), which doesn't appear to be possible on one hard drive? (Both computers are running 10.5.6 if that matters).
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Old 01-06-2009, 09:58 PM
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dnanian dnanian is offline
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You can't really do that on one drive. Although APM can be used by both, Apple strongly discourages it, and the drive won't show up as bootable in the Startup Disk preference pane.
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Old 01-09-2009, 04:32 PM
JB3 JB3 is offline
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Dual Boot Archive Drive

Suggested reading:

http://www.maccast.com/2006/11/03/pp...uper/#more-784

...JB
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Old 01-09-2009, 07:51 PM
TMay TMay is offline
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JB3

Excellent link, thanks. I am about to add my first Intel Macs to my stable, so my interest isn't 100% academic.

The success of the linked procedure may depend, in a sense, on this paragraph:

"The Mac OS X Installation Disc 10.4.6 included with new Intel iMacs, Mac Minis, MacBooks and MacBook Pros was actually formatted using APM. So despite the confusion about the two different architectures, the different partition formats, and the different boot firmware, there is enough in common among the PPC and Intel systems to make ourselves a nice bootable external drive that we can use to backup both our PowerPC and Intel-based Macintoshes."

Do you know if the Leopard install discs included with the newest Intel machines still retain this feature, i.e., "actually formatted using APM?" Perhaps it makes no difference to the "doability" of the project.

TIA
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Old 01-09-2009, 10:20 PM
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dnanian dnanian is offline
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It doesn't matter, actually. APM works with both Intel and Power PC Macs, but as I've said many times here, it's strongly discouraged by Apple (and APM drives won't even show up as a boot option in the startup disk preference pane under Leopard on Intel Macs).

It's best to just stick with APM for Power PC and GUID for Intel.
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Old 01-10-2009, 02:15 PM
TMay TMay is offline
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Thanks Dave, message received.
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