How to partition internal hard drive

I have a G5 Tower with 10.4.11 installed on an internal hard drive with a single partition. In order to partition the drive I have booted from the installation disk, opened Disk Utility, and was surprised to not see an option to partition the hard drive. I think that this has worked in the past but it's not working now.
How can I can partition my internal hard drive? I understand that I will need to reinstall the operating system after I do.
John Link

Well, in 10.4.11 Disk Utility you can only Partition if you erase everything!
But others that may work…
Drive Genius 2…
http://www.prosofteng.com/products/drive_genius.php
iPartition...
http://www.coriolis-systems.com/iPartition.php
And, are you sure you want to partition it? How big is the drive and how much free space do you have?

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