After installing Grub2, you can boot the GPT disk in Legacy BIOS mode. You can only create partitions up to 2TB on MBR disks, if you need to create partitions larger than 2TB or the total size of partitions on disks larger than 4TB, use GPT instead of MBR. For 3TB and 4TB hard drives, you can create multiple partitions with full disk space without having to convert the MBR to GPT, see how to partition a 4TB hard drive.ĪIO Boot now supports installing Grub2 on GPT disks including both HDD and USB.

However, there are several reasons that you must use GPT instead of MBR. So far, MBR is still supported in both UEFI and Legacy BIOS boot. Microsoft also does not support booting Windows on a GPT hard disk in Legacy BIOS mode. However, in some ways, you can still install Windows on a GPT hard drive even if your computer only supports Legacy BIOS mode. However, there are also some issues with GPT booting in Legacy BIOS mode. GPT is part of the EFI specification, of course it will work best in UEFI mode. But maybe it will not be compatible and can not boot up on the BIOS computer, see more here. GPT is modern and has many advantages over MBR.

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