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10.4: Create a simpler PowerPC and Intel boot drive Install
Jonathan Rentsch in this article describes how to make a two-partition external disk that can boot either an Intel or a PowerPC Mac, but it required an extra partition on the Intel Mac. My partner Mike Palacio and I did it without the extra partition, using the following method.

Required: both Intel and PPC Macs, install disks for both, and the external hard drive.
  1. Connect the external drive to the Intel Mac and start up from the Intel Install DVD.
  2. Quit Install and launch Disk Utility.
  3. Format the external drive as GUID (use the Options button). Don't partition it.
  4. Quit Disk Utility, launch Install, and install Mac OS X on the external drive.
  5. After the installation finishes, the Intel Mac restarts from the external drive and you create an account, restart again from the Intel Install DVD. Don't update nor install anything else to keep the size small. You can do it later.
  6. Quit Install and launch Disk Utility.
  7. Create an image of the external drive, and save it on the Intel Mac's hard drive.
  8. Now again format the external drive into two [or more) partitions. This time you will choose APM in the Options. You will use only two of the partitions for the installations.
  9. Label one of the partitions Intel, the other PPC.
  10. Restore the image you made in step seven onto the Intel partition. You can now update and add whatever you want. You have now made an external drive that can boot from Intel Macs.
  11. Shut down everything and connect the external drive to a PowerPC Mac.
  12. Using the PowerPC Install disk, install Mac OS X on the PPC partition of the external drive.
You now have an external disk that can boot from either Intel or PPC Macs. The only glich that we found is that the etc, tmp, and var aliases are visible on the Intel partition. We have not found a way to make them invisible.

[robg adds: I haven't tested this one, and we discussed a related method in this hint.]
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10.4: Create a simpler PowerPC and Intel boot drive | 11 comments | Create New Account
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10.4: Create a simpler PowerPC and Intel boot drive
Authored by: ocdinsomniac on Jun 19, '06 09:01:19AM
You can make /var /tmp /etc etcetera invisible either by using the SetHidden command located on your Tiger install DVD in this folder:
/Volumes/Mac OS X Install DVD/System/\
Installation/Packages/OSInstall.mpkg/Contents/Resources

Or by setting the visibility of said files/folders using the Developer Tools command SetFile like so:
sudo SetFile -a V -P /tmp

Using SetHidden must be done while booted from the problematic partition, so I recommend using the SetFile method, which can be done anytime, anywhere.

More on this issue can be found at the following Apple KBase article:
http://docs.info.apple.com/article.html?artnum=301677

I have also posted some information and a disc image that contains both the SetHidden command as well as a script that will properly set the visibility of all folders on the boot drive:
http://systemsboy.blogspot.com/2006/02/scripts-part-4-cloning-whats-big-deal.html

Hope this helps.

-systemsboy

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10.4: Create a simpler PowerPC and Intel boot drive
Authored by: tota on Jun 20, '06 05:14:19AM

Unfortunately, I can't use this hint, because on my MacMini Intel Core Duo 1.66GHz Install DVD, I don't get the recomended format for formating the external drive.
Any other way to do that?

Best regards
Thomas Thaler



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10.4: Create a simpler PowerPC and Intel boot drive
Authored by: fahirsch on Jun 20, '06 05:13:29PM

The Mac Intel was the same as yours. The formatting options (GUID, APM and Master Boot Record) are available in the PPC Disk Utility too.
In Disk Utility you must choose the Hard Disk (not volumes) and the Partition option comes on.
Hope this helps.
Francisco



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10.4: Create a simpler PowerPC and Intel boot drive
Authored by: rjtolman on Jun 20, '06 01:11:02PM

Tried this several times today. Need more detailed infomation. Unable to format (erase); must click on partion to use GUID formating. Created image ok; unable to restore to new APM; can select image but unabl eto select intel partion to restore to. Would love more details an information on getting this to work. Am going to try this using Netrestore Helper and Netresotore from Mike Bombich.



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the simpler solution we really need...
Authored by: frank nospam on Jun 20, '06 01:30:54PM

...is an Apple firmware update so PPC Macs can boot from GPT formatted HDs.



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the simpler solution we really need...
Authored by: costasppc on Jun 21, '06 02:40:17AM

This cannot be done due to Open Firmware. Guid is accessible due to EFI only.

Kostas Backas



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the simpler solution we really need...
Authored by: boli on Jun 25, '06 02:11:42AM
some (few) PPC Macs *can* boot off a GPT disk, see my (boli's) comments here and check out sphns's replies.

[ Reply to This | # ]
10.4: Create a simpler PowerPC and Intel boot drive
Authored by: costasppc on Jun 21, '06 02:41:20AM

This cannot be done due to Open Firmware. Guid is accessible due to EFI only.

Kostas Backas



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10.4: Create a simpler PowerPC and Intel boot drive
Authored by: apolet on Jul 20, '06 08:08:27AM

I found a mistake in this hint and I'll tell you how to make it work.
Here are the right steps to follow (note step 10!):

1-Connect the external drive to the Intel Mac and start up from the Intel Install DVD.

2-Launch Disk Utility.

3-Partition the external drive as GUID (use the Options button), make a single partition.

4-Quit Disk Utility. Back in Install, you can now install Mac OS X on the external drive.

5-After the installation finishes, the Intel Mac restarts from the external drive and you create an account. Restart again from the Intel Install DVD. Don't update nor install anything else to keep the size small, you will understand in step 7 (*).

6-Launch Disk Utility again.

7-Create an image ("New Image" button) of the newly created volume on your external drive, and save it on the Intel Mac's internal hard drive.
(*) Now you understand.

8-Format the external drive again into two [or more) partitions. This time you will choose "Apple Partition Scheme" in the Options. You will use only two of the partitions for the installations.

9-Label one of the partitions Intel, the other PPC.

10-Restart the Intel Mac from its internal HD, mount the image you created in step 7, and launch disk utility.

11-Restore the image you made in step 7 onto the Intel partition. You can now update and add whatever you want. You have now made an external drive that can boot from Intel Macs.

12-Shut down everything and connect the external drive to a PowerPC Mac.

13-Using the PowerPC Install disk, install Mac OS X on the PPC partition of the external drive. You now have an external disk that can boot from either Intel or PPC Macs !

---
apO - PM G5 2 x 2.5 - Final Cut Studio



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10.4: Create a simpler PowerPC and Intel boot drive
Authored by: oihenart on Oct 09, '06 07:15:50AM

A simple way which works for us. We have both Macs PPC ans Macs Intel. So we have made an image with a system minimum for each type (we use carbon copy cloner).
We format our external disk on an emac with two partitions. We use APM as options.
We restore the first partition with the Intel image and the second with the PPC image (we use NetRestore)
And so, we have a disk which can boot Macs PPC and Intel.



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10.4: Create a simpler PowerPC and Intel boot drive
Authored by: mickmacguy on Feb 09, '07 09:49:59AM

This scheme will definitely NOT work with the newest Mac Pro (1/2007). It will not even boot if you have an ext. Firewire drive connected that is formatted in Apple Partition format. I even had trouble mounting the ext. drive on the Mac Pro's desktop after booting. REALLY annoying, thanks for the new incompatible disk format, Apple! The workaround: boot from the system DVD that came with the Mac Pro, and run disk utility from it. THEN hook up the external drive and you can image to and from it. Works. Oddly, my Intel iMac has no problem with ext. drives in either Apple or GUID format. Posted by Mick, a/k/a Mac parts seller oicu81 on ebay...



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