Non guid partition on original macbook drive?! can't install leopard

Just got Leopard today, and tried to install - installation process gives me error that I cannot install on my current boot disk due to GUID partition table something something. And to fix it I need to reformat my drive!!
I am using a MacBook with it's original 80GB disk and 10.4 installation, I've never reformatted this disk or done anything weird. Why would Leopard require me to reformat my disk and wipe all my configuration, settings, files etc. when I am upgrading from an out of the box macbook tiger installation?!

Run DU and click on your internal HD. Select the HD itself, not a partition
At the bottom right you will see the Partition Map Scheme.
For Intel Machines with Leopard it must be GUID
For PPC it must be APS (Apple Partition Scheme)
You need a backup anyway. Nobody installs any new OS without one.
Create a bootable clone on an external drive, test it out, by booting it, then reformat your drive and if you wish, reinstall the cloned OS on your internal drive and then use the Leopard upgrade.
Disconnect your external drive before upgrading.

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https://discussions.apple.com/thread/4720126?tstart=0
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Call Apple Sales...in the US: 1-800-MY-APPLE. Or Support... 1-800-275-2273
Other countries...
http://support.apple.com/kb/HE57
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Non guid partition on original macbook drive?! can't install leopard

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