Converting a UEFI motherboard from GPT to MBR?

[wpr21]

Hello,

Would I have to disable Secure Boot as well?

Thank you.

 

[AddRAM]

Not necessarily, you`d have to test.

 

[wpr21]

Thank you.

 

[AddRAM]

By the way, your thread title is totally inaccurate, you don`t convert a motherboard, you convert a hard drive from GPT to MBR etc.

But I`m sure you knew that

 

[LordSnow]

The agreement between the firmware and the hard disk partition scheme is essential for locating the boot loader for the Operating System and hence, is the first step in the installation process of windows on a computer system. By default, recent hardware boot using UEFI mode. if one tries to use an old hard disk (MBR) with an updated UEFI-based system, the message “Windows Cannot be Installed On this device” pops up. This is because old hard drives maintain partitions using MBR scheme which is not supported in UEFI-based systems. Therefore, for windows installation, it is important to configure the system to boot with the legacy BIOS-compatibility mode if you want to convert GPT to MBR disk.

By the way, you can use a freeware AOMEI Partition Assistant to convert disk between MBR and GPT without data loss.

 

[Nipax]

By the way, you can use a freeware AOMEI Partition Assistant to convert disk between MBR and GPT without data loss.

SOURCE: Convert GPT to MBR or convert MBR to GPT without data lose

Note: AOMEI Partition Assistant only supports to convert non-system disk (data disk) from MBR to GPT or GPT to MBR without losing data, does not support for converting system disk between MBR and GPT.

The agreement between the firmware and the hard disk partition scheme is essential for locating the boot loader for the Operating System and hence, is the first step in the installation process of windows on a computer system. By default, recent hardware boot using UEFI mode. if one tries to use an old hard disk (MBR) with an updated UEFI-based system, the message “Windows Cannot be Installed On this device” pops up. This is because old hard drives maintain partitions using MBR scheme which is not supported in UEFI-based systems. Therefore, for windows installation, it is important to configure the system to boot with the legacy BIOS-compatibility mode if you want to convert GPT to MBR disk.

Here is more info:

How to convert disk from MBR to GPT or GPT to MBR if you do not want to keep the existing partition style.

Convert MBR to GPT:
1. Boot from the Windows 7/8/10 USB/DVD in UEFI mode.
2. Delete all partitions on the disk until it's unallocated.



Convert GPT to MBR:
1. Boot from the Windows 7/8/10 USB/DVD in Legacy BIOS mode.
2. Delete all partitions on the disk until it's unallocated.



Installing to the unallocated space and letting Windows create the partition table and partitions works with either Legacy BIOS or UEFI boot mode.

On an MBR disk, Windows 7/8/10 setup will create a System Reserved partition and a primary Windows partition.

On a GPT disk, Windows 7/8/10 setup will create a Recovery partition (not in Windows 7), an EFI System partition, a Microsoft Reserved partition (won't show in Disk Management), and a primary Windows partition.