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10.5: Verify partition map prior to upgrading System 10.5
If you have, in the past, swapped your system hard drive on your Intel Mac, you might want to check its partition scheme before upgrading to Leopard.

I swapped my MacBook's internal drive shortly after buying the laptop. I formatted it as an external drive, used Carbon Copy Cloner to clone my internal drive, then did the swap. It has been running fine until now. Then, when I tried to upgrade to Leopard, the installer wouldn't let me, telling me I need to repartition my drive.

Apparently, I had used the Apple Partition Map when I formatted the drive, which is supposedly only good for using as a bootable system drive for PowerPC Macs. Leopard, however, will only install (on an Intel Mac) on a drive formatted using the GUID Partition setting, which is designed to be used for boot discs for Intel based Macs. I don't know why my MacBook was working fine till now, but that's how it was.

So basically, I had to use CCC to clone my disk again, reformat the drive, and restore it with the clone, and finally after that, I got to upgrade to Leopard. You can check the partition scheme by going into Disk Utilities, clicking on the hard drive (NOT the partition under it) and clicking Get Info.
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10.5: Verify partition map prior to upgrading
Authored by: cm on Oct 29, '07 07:43:13AM

I had this problem as well. The only problem I ever had before leopard was that I couldn't actually get Boot Camp to partition my drive. Coincidently for this upgrade I bought a new drive. So I installed on the new drive and then used the migration assistant to move over all my stuff. The migration assistant took about an hour or two, but I was really impressed with the output. All of my documents and applications are now happily running on my new setup without any license or path issues.

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Me too
Authored by: Gee4orce on Oct 29, '07 08:18:31AM

I had exactly the same problem too, and for the exact same reason ! I couldn't understand how my Macbook has been working all this time. Fortunately, my laptop is my secondary machine, so an erase and install was a viable option.

It does answer a vexing question though - ever since upgrading the laptop's Hard Drive the disk itself had been making curios beeping sounds at irregular intervals. Since reformatting with the correct partition scheme, and installing Leopard, the sound has gone. It must have been some kind of warning about the disk attempting to access invalid parts of the platter ? Anyway, mystery solved.

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APM Disks
Authored by: macavenger on Oct 29, '07 09:19:16AM

Intel macs will boot quite happily from disks formated with the APM partitioning scheme- even on 10.5. You just can't install onto one of these disks from an intel mac. This fact come in handy if you have a mix of computers, as 10.5 is now completely universal- just install onto an external drive formated with the APM from a PPC box, and you've got a boot disk that can boot both intel and PPC macs.

Aluminum iMac 20" 2.4 GHz/3GB/300GB HD

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10.5: Verify partition map prior to upgrading
Authored by: RandallW on Oct 29, '07 08:46:25AM

I too went through the same issue. Strangely, when I formatted the drive I bought, I didnt think to change the partition formating to the GUID Table. Since I'm running an Intel Mac, you would think it would come up by default...

So yeah, I went through the whole issue of deleting some stuff to make it small enough to fit on my old drive. =P

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10.5: Verify partition map prior to upgrading
Authored by: wallsbk on Oct 29, '07 11:26:46AM

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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10.5: Verify partition map prior to upgrading
Authored by: MacHound on Nov 11, '07 05:36:53PM

> "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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10.5: Verify partition map prior to upgrading
Authored by: flognoth on Oct 29, '07 03:24:25PM

Apple Partition Scheme is actually a supported partition scheme for the Intels.

The only gotcha is you can't install it as an OS the GUI. If you create an image of a bootable Intel based Mac and then restore it on to a Apple Partition Scheme drive or partition it will boot and be fine.

This technique can used to create a dual partitioned utility drive so you only need one drive to boot both architectures - though the each architecture will need it's own partition.

The new question is using the above method - can you make a single partitioned utility drive using Leopard (since it is now Universal) that will run on both architectures?

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