Step 3: Choose Your Guest OS
However, one thing to consider is to use an OS that has modest system requirements. If your guest OS is system-resource hungry, you will either run out of hard drive space or RAM. I decided to use Ubuntu 8.10, latest version at time of writing. Ubuntu's minimum system requirements are 256 MB of RAM and 4 GB of hard disk space.
You will need to either have your chosen operating system's install disc or download its ISO disc image.