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Windows 7: How can I configure a UEFI motherboard for MBR instead of GPT?

01 Jan 2016   #1
marisa69

W7 64-bit
 
 
How can I configure a UEFI motherboard for MBR instead of GPT?

My new upgrade box (with no OS) has a EUFI motherboard.

I just did a test install of W7 (on an old HDD) and it ended up with GPT partitioning.

I don't want that, I want MBR. (And if you don't mind, I don't want to get into a discussion about WHY I want to do this. Thank you).

Does anyone know (and can explain in words of no more than two syllables to this old girl) which settings in UEFI I need to change?

I already have an idea it might be something to do with 'Secure Boot', and maybe 'CSM', but the complexities of UEFI are very confusing.

Thank you very much :-)


My System SpecsSystem Spec
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01 Jan 2016   #2
AddRAM

Windows 7 Pro x64 Windows 10 Pro x64
 
 

Go into the Bios, there should be an option to enable Legacy or Legacy & UEFI

Once you enable that, hit F10 to save and exit.

If you now have a GPT disk, you will have to convert it back to MBR

Convert GPT Disk to MBR Disk
My System SpecsSystem Spec
02 Jan 2016   #3
teckneeculler

XPPSP3, Win7Ultimate
 
 

AddRAM, I think there might be a bit more required than just changing Boot to 'Legacy' or 'Legacy + UEFI'.

For example, see this link:
Code:
https://technet.microsoft.com/en-us/library/hh825112.aspx
"To use BIOS-compatibility mode, check for options in the firmware menus to disable UEFI SecureBoot features."
"If you install Windows by using Windows Setup or the Windows installation DVD, use a preformatted hard drive on your destination PCs. Use the GPT file format for UEFI mode, or the MBR file format for BIOS mode."

"UEFI: To prevent Windows Setup or Windows PE from booting in BIOS mode, remove the bootmgr file on the root of the media.
BIOS: To prevent Windows Setup or Windows PE from booting in UEFI mode, remove the efi folder on the root of the media."

Also, someone on Tom's Hardware said:
"...if you mount a disk that's already been formatted in MBR, the OS install will be MBR."

Which was also said above in the first link
My System SpecsSystem Spec
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02 Jan 2016   #4
Nipax

Windows 7/8/10 UEFI/GPT system
 
 

Quote   Quote: Originally Posted by AddRAM View Post
If you now have a GPT disk, you will have to convert it back to MBR

Convert GPT Disk to MBR Disk
If you delete all the partitions you don't need the convert.

Boot from the Windows install media. Select the custom install option and delete all the partitions on the HDD.

Installing to the unallocated space and letting Windows create the partitions works with either GPT or MBR mode.
My System SpecsSystem Spec
02 Jan 2016   #5
marisa69

W7 64-bit
 
 

Nipax, it would be nice if it were that easy.

If you read my first post again, you'll see that installing to an empty, unallocated hard drive was exactly what I did.

And the partition ended up GPT.
My System SpecsSystem Spec
02 Jan 2016   #6
ThrashZone

Win-7-Pro64bit 7-H-Prem-64bit
 
 

Hi,
What size is the hdd ?
What is the mother board ?
Use the link above my signature to fill in your system spec's page

I doubt secure boot has anything to do with the issue you seemed to have installed without any issue except the hdd format.
Which points to a larger than normal sized hdd you installed windows on and you possibly made a smaller partition to install windows on :/
My System SpecsSystem Spec
02 Jan 2016   #7
Nipax

Windows 7/8/10 UEFI/GPT system
 
 

How do you select GPT or MBR when installing Windows 7/8/10.

Windows 10 partition installs? - Windows 10 Forums
My System SpecsSystem Spec
02 Jan 2016   #8
marisa69

W7 64-bit
 
 

TrashZone, the drive was a 120GB SATA that had been bare-metal cleaned with WipeDrive Pro 3.02.

Nipax, that's exactly my question, "How do you select GPT or MBR when installing Windows 7/8/10". Except I have no interest in Windows 8 or 10. Windows 7 will do me nicely until 2020, at which time I'll think again.
My System SpecsSystem Spec
02 Jan 2016   #9
ThrashZone

Win-7-Pro64bit 7-H-Prem-64bit
 
 

I can't see how any of that tenforums stuff applies here
Is this a samsung computer or drive ?
Obviously this program to wipe the drive did not do such a good job there's no reason a 120gb drive would be gpt.
My System SpecsSystem Spec
02 Jan 2016   #10
GEWB

Linux (Mint is primary) / XP, Win7 Home / Win7 Pro, Ultimate / Win8.1 / Win10 archived VM
 
 

See if this link helps:

https://technet.microsoft.com/en-us/.../cc725797.aspx

Regards,
GEWB
My System SpecsSystem Spec
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 How can I configure a UEFI motherboard for MBR instead of GPT?




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