Create a mebibyte partition (+1M with fdisk or gdisk) on the disk with no file system and with partition type GUID 21686148-6449-6E6F-744E-656564454649.
Select partition type BIOS boot for fdisk.
Select partition type code ef02 for gdisk.
For parted set/activate the flag bios_grub on the partition.
This partition can be in any position order but has to be on the first 2 TiB of the disk
https://wiki.archlinux.org/index.php/GRUB
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https://wiki.frugalware.org/index.php/GRUB2
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