Guid formatted external drive and PPC

I just purchased an external enclosure to work with a 320B Seagate Barracuda drive I have. Wanting to have an Intel bootable drive running Tiger, I formatted the drive with Disk Utility into two partitions with the Guid option selected. Drive works fine on my MacBook, but isn't recognized by my PPC Titanium Powerbook running Panther. The disk won't mount on the Powerbook, and says it needs to be formatted. Disk Utility on the Powerbook can see the drive, but not the partitions.
Is this normal? I know you can't boot from the Powerbook with a Guid formatted drive, but shouldn't it be able to see the partitions? Will it help to update the Powerbook to Tiger, or do I need to reformat the drive without Guid? I haven't put much data on the new drive yet, so it wouldn't be a huge problem, except that I wouldn't be able to boot the MacBook with the drive.
I've read in the forums that Super Duper supposedly can create an Intel bootable partition on a ATP formatted drive. Anyone with actual experience doing this?
Thanks.
MacBook 2GHz Mac OS X (10.4.9)

UPDATE for anyone who is interested:
I reformatted the external Seagate drive with APM partitioning using my MacBook. I then connected the external drive to the Powerbook and it recognizes the drive with the two partitions. Then I reconnected the drive to the MacBook, and using Super Duper! copied my internal drive's contents to the external drive. I booted the MacBook using the external drive and it works!!!
However, trying to boot the PowerBook using the external drive resulted in a kernel panic crashing the PB--not surprised, since the system on the external is for the MacBook.

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