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Windows 7: Convert MBR to GTP

06 Jul 2015   #1
Mitch656

Windows 7 Professional 64bit
 
 
Convert MBR to GTP

Hi,
I'm trying to install Windows 10 TP, but every time I do I get the message that windows cant be installed on a MBR disk.

Is it possible to partition the drive and then make the partition a gtp drive?

As the other half of my drive has my windows 7 install and I don't want to loose that

Thanks :)


My System SpecsSystem Spec
.
06 Jul 2015   #2
AddRAM

Windows 7 Pro x64 Windows 10 Pro x64
 
 

You can`t convert it then.

There`s no reason you can`t install 10 to a MBR drive.

You don`t want to install 10 on the same drive anyway.

How did you prepare the W10 installer ?
My System SpecsSystem Spec
06 Jul 2015   #3
Mitch656

Windows 7 Professional 64bit
 
 

Quote   Quote: Originally Posted by AddRAM View Post
You can`t convert it then.

There`s no reason you can`t install 10 to a MBR drive.

You don`t want to install 10 on the same drive anyway.

How did you prepare the W10 installer ?
I always get this error message
Windows cannot be installed on this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only installed on GPT disks.


I simply Partition my SSD and created an ISO DVD to install it, and when I sleeved the partition drive I get that error.


Did some googling and it said to boot using the UEFI option and if I selected it correctly it still didn't work
My System SpecsSystem Spec
.

06 Jul 2015   #4
genet

Windows 8.1/10 x64
 
 

Quote   Quote: Originally Posted by Mitch656 View Post
I always get this error message
Windows cannot be installed on this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only installed on GPT disks.
Quote   Quote: Originally Posted by Mitch656 View Post
As the other half of my drive has my windows 7 install and I don't want to loose that.
If you want to use MBR (Master Boot Record) partition table, then boot from the Windows installation media in Legacy BIOS Boot Mode.

Quote from this post: UEFI Boot Mode (installing using the GPT partition style) and Legacy BIOS Boot Mode (installing using the MBR partition style). -> link

Quote:
Tip   Tip
Error message when you boot from the Windows installation media in Legacy BIOS Boot Mode:

Windows cannot be installed to this disk. The selected disk is of the GPT partition style. (see screenshot below)

That is because Windows can only be installed to MBR disk in Legacy BIOS Boot Mode, but you plan to install Windows on a GPT disk.

- Boot from the Windows installation media in UEFI Boot Mode, so you can use GPT (GUID Partition Table).
- But if you want to use MBR (Master Boot Record) partition table, then delete all partitions on the disk.

Convert MBR to GTP-windows-cannot-installed-disk.-selected-disk-gpt-partition-style.png

Error message when you boot from the Windows installation media in UEFI Boot Mode:

Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks. (see screenshot below)

That is because Windows can only be installed to GPT disk in UEFI Boot Mode, but you plan to install Windows on an MBR disk.

- Delete all partitions on the disk, so you can use GPT (GUID Partition Table).
- But if you want to use MBR (Master Boot Record) partition table, then boot from the Windows installation media in Legacy BIOS Boot Mode.

Convert MBR to GTP-windows-cannot-installed-disk.-selected-disk-has-mbr-partition-table.png


My System SpecsSystem Spec
06 Jul 2015   #5
gregrocker
Microsoft MVP

 

Hey Mitch. Long time no see.

The error means you're booting the installer as a UEFI DVD. It expects to see a GPT formatted disk which is the only way UEFI installs, but you have Win7 on an older MBR disk so it generate the error.

This should be resolved by booting into the disk as a legacy device. You'll notice your BIOS boot menu will be similar to this:


In the case of the above menu, instead of choosing the second UEFI DVD choice you'd choose the fourth one for DVD/CD. Look for a similar difference in your Boot Menu key when you tap it at boot with the Win7 DVD in drive.

If in doubt post back a picture of the Boot menu choices.
My System SpecsSystem Spec
06 Jul 2015   #6
Mitch656

Windows 7 Professional 64bit
 
 

Quote   Quote: Originally Posted by gregrocker View Post
Hey Mitch. Long time no see.

The error means you're booting the installer as a UEFI DVD. It expects to see a GPT formatted disk which is the only way UEFI installs, but you have Win7 on an older MBR disk so it generate the error.

This should be resolved by booting into the disk as a legacy device. You'll notice your BIOS boot menu will be similar to this:


In the case of the above menu, instead of choosing the second UEFI DVD choice you'd choose the fourth one for DVD/CD. Look for a similar difference in your Boot Menu key when you tap it at boot with the Win7 DVD in drive.

If in doubt post back a picture of the Boot menu choices.

Thanks Greg.
It's worked.

I tried P1 which took me straight to Windows 7 desktop, but I had a P2 options and am now instailling the TP.

Thanks a lot :)
My System SpecsSystem Spec
06 Jul 2015   #7
gregrocker
Microsoft MVP

 

Glad it helped pupster.

Enjoy Windows 10. I've been using it since October. It seems faster and more stable. Some of the apps are good and can be grouped on the right side of the start menu to give you live updates on your Mail, People, Weather, News, Skype, and a ny Others You like.
My System SpecsSystem Spec
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 Convert MBR to GTP




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