Use Multi-Volume Packaging
This feature is used to create an installer which uses multiple volumes to install the project.
Size of Each Volume
Here you can specify how big you want each volume to be. Each volume created will be the same size and the number of volumes will usually depend on the amount of free space on the first volume and the total size of the packs.
Free Space on First Volume
This is the amount of free spaces you want on the first volume. This free space is used to put the installer, additional resources and the first installer.pak. The other installer.pak will be on the other volumes.