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Before you are able to install OpenSUSE Linux on your PC (Personal Computer) you will need free up space for the install. I recommend a minimum of 10GB for your OpenSUSE Linux install, with no upper limit, depending on your personal needs. At a bare minimum I do like to see 8GB for a combined root (/) and home (/home) partition as well as a 2GB
swap partition. Ideally, if you can spare the room, I'd like to see 3 partitions; a 6-8GB root (/), 2GB swap (this is overkill on most systems and will generally end up being less if you use the partitions suggested by the installer.), with home (/home) taking up the remaining space. One thing to keep in mind is that the OpenSUSE Linux installer will use the 3 partition setup if you accept the default partitioning scheme so the more space you can spare, within reason, the better!
To access the disk management system on your Windows XP system:
start button
> control panel
> performance and maintenance
> administrative tools
> computer management
> disk management system 
At this point you will have to create a new partition to hold your OpenSUSE Linux partitions. You may need to resize, delete or move partitions to free up the space you will need depending on your current hard drive setup. Whichever scenario is applicable the end result must be a solid block of free space in which you will create your OpenSUSE Linux partitions once you have booted the OpenSUSE Linux LiveCD.