robbat2@gentoo.org base-system@gentoo.org Gentoo Base System Bootable MBR including fake partition records, for legacy BIOS without any GPT support, and usable without hybrid disk layouts. Install directly at the start of a disk, create GPT, ensure at least one partition has GUID set to BIOS Boot Partition (21686148-6449-6e6f-744e-656564454649).