The final step in the installation process is to create a boot disk. It is highly recommended that you do so. If there are any problems with the system disks that can prevent the system from booting properly a boot disk will solve your problem.
The boot disk is to be used as a rescue tool only. It contains a kernel with minimal security installed in it so that you can fix a damaged system.
To create the disk insert a blank disk and hit Ok. When the disk has been created the following screen will appear: