How do partition a hard drive with different partition schemes?

How can you partition an external HD with different partition schemes for different partitions? GUID one one partition and Apple Partition Map on another?
Thanks.

I am trying to add a second partition to my (1TB) external firewire HD. Apparently it was preformatted as "MS-DOS (FAT)" and I started putting lots of files on there. Now the "partition" option in disk utility shows me the one partition that's on there, but all options are grayed-out - I cannot add another partition, it seems, nor change anything on the existing one. Is there any possible solution other than totally erasing the disk and starting from scratch? I would be hard-pressed to find enough disk space to (even temporarily) store the stuff that's already on that HD.

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