Master Boot Record (MBR) specific instructions To have the viewable partitions begin at the base consider adding this partition last. In fdisk or gdisk create a new partition starting at sector 34 and spanning to 2047 and set the type. Since the partition will not be regularly accessed performance issues can be disregarded, though some disk utilities will display a warning about it. The space before the first partition can also be used as the BIOS boot partition though it will be out of GPT alignment specification. When the partition is ready, install the bootloader as per the instructions below. This partition needs to be created before GRUB installation. This partition can be in any position order but has to be on the first 2 TiB of the disk.
For parted set/activate the flag bios_grub on the partition. 
Select partition type code ef02 for gdisk. 
Select partition type BIOS boot for fdisk. However, UEFI systems still require an EFI system partition.Ĭreate 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. For UEFI systems this extra partition is not required, since no embedding of boot sectors takes place in that case. On GPT, however, there is no guaranteed unused space before the first partition. On a BIOS/MBR setup, GRUB uses the post-MBR gap for the embedding the core.img. The BIOS boot partition is only needed by GRUB on a BIOS/GPT setup. Read more on Partitioning#GUID Partition Table. Before attempting this method keep in mind that not all systems will be able to support this partitioning scheme. 
GRUB embeds its core.img into this partition. On a BIOS/ GPT configuration, a BIOS boot partition is required.
6.18 GRUB is installed but the menu is not shown at bootīIOS systems GUID Partition Table (GPT) specific instructions. 6.16 Device /dev/xxx not initialized in udev database even after waiting 10000000 microseconds. 6.5.2 Create a GRUB entry in the firmware boot manager. 4.2.3 Chainloading Windows/Linux installed in UEFI mode. 4.2.2 Chainloading a disk's MBR or a partitionless disk's VBR. 4.2 Using the command shell environment to boot operating systems. 3.2.1.3.3 Windows installed in BIOS/MBR mode. 3.2.1.3.2 Windows installed in UEFI/GPT mode. 3.2.1.2.3 Chainloading a unified kernel image. 3.2.1.1.3 "UEFI Firmware Settings" menu entry. 
3.1.2 Detecting other operating systems.3.1.1 Generate the main configuration file.1.2 Master Boot Record (MBR) specific instructions.1.1 GUID Partition Table (GPT) specific instructions.
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