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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.
gparted display after creating Linux partitions
Here I have created a linux-swap partition and an empty ext2 partition - the specific file system type is not important at this point, because it will be reformatted when the Linux root is installed to it. Now the disk is laid out the way I want it, and I am ready to boot the openSuSE Live USB.
The openSuSE 12.3 KDE Live Desktop
The openSuSE Live ISO image is UEFI and Secure Boot compatible, so I don't need to change anything in the system BIOS to boot it.
Depending on the boot device priorities on your system, you may need to press the Boot Select key (variously ESC, F9, F12 or whatever) and then select the CD/DVD/USB device containing the openSuSE Live image. The installation process can then be started by selecting the Install icon on the desktop.