You can use GPT and BIOS – there's some subtle differences. You will need to create an unformatted partition size 8M-32M (Calamares uses 32M) and this partition must be of the type BIOS BOOT (0xEF02). When you install the bootloader using GPT you must install to partition e.g. /dev/sdyX.When installing Windows*, the partition style used will determine if UEFI mode or legacy BIOS mode is supported. UEFI mode is compatible with the GUID Partition Table (GPT) partition style, while the legacy BIOS mode is compatible with the Master Boot Record (MBR) partition style.To boot your PC in UEFI mode, you'll need to use a drive formatted using the GPT drive format. Many PCs are ready to use UEFI, but include a compatibility support module (CSM) that is set up to use the legacy version of BIOS.

Can legacy BIOS read GPT partition : Legacy MBR boot is not able to recognize GUID Partition Table (GPT) disks. It requires an active partition and supporting BIOS to facilitate access to disk. OLD and limited on HDD size and number of partitions.

What is GPT in BIOS

GUID partition table (GPT) disks use the Unified Extensible Firmware Interface (UEFI). One advantage of GPT disks is that you can have more than four partitions on each disk. GPT is also required for disks larger than 2 terabytes (TB).

Does GPT need EFI : The device must contain a system partition. On GPT drives, this is known as the EFI System Partition, or the ESP. This partition is usually stored on the primary hard drive. The device boots to this partition.

Most computers today are using a Class 2 , with UEFI and CSM(Compatibility Support Module) which supports GPT and MBR partitioned disks. Class 1 as mentioned is to be strictly CSM which emulates legacy BIOS mode, and technically, does not support Guid Partitioned Disk (GPT).

While I understand that the world of disk partitioning and bootloaders can be confusing, I can assure you that the idea that UEFI can only boot from GPT disks is a common misconception. In fact, UEFI can boot from MBR disks just fine, as long as the MBR is using the EFI System Partition (ESP) scheme.

How do I convert GPT to UEFI

1. Open "Command Prompt" with administrator privileges.
2. Issue the following command: mbr2gpt.exe /convert /allowfullOS.
3. Shut down and boot into your BIOS.
4. Change your settings to "UEFI mode."

When you deploy Windows to a UEFI-based device, you must format the hard drive that includes the Windows partition by using a GUID partition table (GPT) file system. Additional drives may use either the GPT or the master boot record (MBR) file format.Choosing the Best Partitioning Scheme

MBR is compatible with legacy and older operating systems that do not support GPT. On the other hand, if you have a newer computer with UEFI firmware, GPT is recommended for better compatibility and support for modern features.

GPT, on the other hand, is a newer partitioning scheme that allows for more flexible partitioning. Lastly, EFI is used to boot the computer and provides an interface between the operating system and the hardware.

Is MBR or GPT better for UEFI : MBR is compatible with legacy and older operating systems that do not support GPT. On the other hand, if you have a newer computer with UEFI firmware, GPT is recommended for better compatibility and support for modern features.

Does all motherboard support GPT : Generally, for a drive to be bootable it must use either an MBR or a GPT partitioning scheme, and the level of support for GPT is dependent on the firmware of your motherboard. So unless you are running a system with UEFI BIOS, your motherboard may not have full support for GPT.

Does UEFI use GPT

When you deploy Windows to a UEFI-based device, you must format the hard drive that includes the Windows partition by using a GUID partition table (GPT) file system. Additional drives may use either the GPT or the master boot record (MBR) file format.

Open Command Prompt with administrator privileges. Restart the system and boot into the system BIOS. Change the settings from Legacy BIOS mode to UEFI mode.Q: Should I use NVMe drives with MBR A: No, Dell Technologies recommends NVMe drives be configured using UEFI & GPT for optimal performance, security, and reliability.

Can I convert MBR to GPT : The recommended method to convert these disks is to upgrade the operating system to a currently supported version of Windows, then perform the MBR to GPT conversion. After the disk has been converted to GPT partition style, the firmware must be reconfigured to boot in UEFI mode.