bea...@sdf.org (beaker) writes: > gpt biosboot [-A] [-c bootcode] [-b startsec] [-i index] [-L label]
>for a gpt partitioned disk or is this relatively recent addition >just an alternative of convenience? It's a bit complicated. A regular BIOS (not UEFI) loads the MBR from block 0 of a disk. The boot program in the MBR checks the embedded partition table and then continues to load a PBR from the first block of the active partition. The PBR is then executed and continues with the boot process. MBR = master boot record PBR = partition boot record We maintain the regular MBR (and the partition table) with the fdisk program (and the PBR with the installboot program). If you use a GPT, there is only a "protective MBR" for compatibility. But it's still possible to include a boot program in that "protective MBR" that understands a GPT. This allows to use BIOS to boot from a GPT formatted disk. We maintain the GPT with the gpt program and 'gpt biosboot' stores such a special boot program. In your case however, you provide your own MBR (with grub) and 'gpt biosboot' would just overwrite grub with our boot program.
