Mac Hard Drive Partition

Hi,
I have a iMac OS X 10.4.11. I am wondering if I partition my hard drive (from the disk) will it delete all my data? I wish to make a new partition, of 100gb (I have 230gb of free space), in order to install a Windows operating system. When I go to the partition menu I set up the information and click partition. When I click partition it says that it will destroy all the data... Now I'm wondering if it means that it'll completely destroy the data on the hard drive or its just a message posted incase if I had information of the 100gb of free space. Also... if anyone knows.... If this does destroy all the data on the disk, then why does it? I know what a partition is and I have set partitions up on Windows based computers and had no problems what so ever. I just used free space on the hard drive.... Also I am aware of the buyable programs that I could get so I wouldn't have this problem, but honestly I think this whole situation is ridiculous.

When I click partition it says that it will destroy all the data... Now I'm wondering if it means that it'll completely destroy the data on the hard drive
It says it will destroy all the data, and it means it...!
Disk Utility in Leopard can add a partition to the free space "on the fly," but that feature is not available in Tiger's Disk Utility. There are some third party software that claims to do it. For example
http://www.coriolis-systems.com/iPartition.php
Personally, I don't trust repartitioning without erasing. I always clone (backup) the existing volumes to an external drive, re-partition (erase in the process) the whole drive, then restore by cloning back.
in order to install a Windows operating system.
If you are using Tiger, and you are planning to use Boot Camp for running Windows, Boot Camp was in beta for Tiger. The final release version of the Boot Camp utility is only in Leopard. Also, if using Boot Camp, I believe the Boot Camp utility creates the Windows partition. I don't think you need to (or should) do it separately using Disk Utility.
If you are using Parallels Desktop or VMware Fusion (or other +virtual machine+ program) to run Windows, creating a separate Windows partition is not the best way to install Windows, in my opinion.

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