Document URL: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/composing_a_customized_rhel_system_image/preparing-and-deploying-kvm-guest-images-with-image-builder_composing-a-customized-rhel-system-image#doc-wrapper Chapter 8. Preparing and deploying KVM guest images using image builder Description: when Image Builder generates a disk image, the partitioning is done to have a "dually bootable" image: BIOS mode or UEFI mode. For this to happen, the partition table is created in GPT and a BIOSBOOT partition is created, along with the UEFI partition. This seems to be confusing for customers that specify their own partition layour, because they do not expect to get these additional partitions. Request: Add a paragraph explaining the description above.