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Intel method
Authored by: silentaccord on Dec 21, '06 09:18:53PM
It's been awhile since you asked so I hope you figured it out. I'll post what I know in case anyone else with an Intel Mac has trouble. All you should have to do are steps 1 and 2 from my previous post.

The default setting on Intel Macs when using the diskutil partitionDisk command is to create a GUID partition table (aka GPT). The FAT32 partition created this way should be recognized by Windows without having to create a master boot record. I was able to successfully reformat the FAT32 partition as NTFS from Windows (I'm not sure why you had trouble; maybe Partition Magic just doesn't like the GPT). The NTFS partition can then be mounted on the Mac but as always, it's read-only. Macs running OS X 10.3 or 10.4 can read and write to the HFS+ and FAT32 partitions but only Intel Macs will be able to boot from the HFS+ partition because of the GPT. OS X 10.2 seems to read both partitions fine but locks up when trying to write. OS 9 won't recognize the disk at all.

It's still possible to do the old method with an Apple partition map on Intel Macs. You just have to add APMFormat to the command in step 2:

diskutil partitionDisk disk1 2 APMFormat HFS+ Mac 18G MS-DOS PC 10G
The rest of the instructions remain the same except that I had to sudo the pdisk and fdisk commands. The advantage of doing it this way is that the HFS+ partition(s) will be bootable for PowerPC and Intel Macs (although an Intel system must be cloned to the drive since the Intel installer doesn't like APM disks). This method also retains OS 9 and OS X 10.2 compatibility.

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