Unfortunately this is not working. We need to provide the absolute path for the disk device, not some relative path to a partition. So the example should be /dev/sda Reported by: shetze https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/composing_installing_and_managing_rhel_for_edge_images/composing-rhel-for-edge-images-using-image-builder-in-rhel-web-console_composing-installing-managing-rhel-for-edge-images#annotations:eb674055-14e4-493c-a8af-c9ef4b0483cd