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The Linux gparted Disk Partitioning Utility
The Linux gparted utility is one of the common alternatives for disk and partition management. It is included on a lot of Live CD/USB distributions, such as Debian, Ubuntu, Mint, and openSuSE.
It can be found through the menus, generally under "Administration" or some such, or by typing it in the menu/application search box.
The display is shown above, with the Windows C: partition already reduced. If I had wanted to reduce the partition, I'd just select it in the list or graphic, and then click the Resize/Move button on the icon bar.
That will pop up a window where you can enter the new size. Once the disk layout looks like the one shown above, you are ready to install openSuSE (or any of the most popular Linux distributions), as the installer will automatically allocate the necessary partitions for swap, root and home.
However, as I mentioned previously, I am a bit of a control freak, and I prefer to create the Linux partitions manually. So I take one more step with gparted.