EFI requires GPT

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skipro
Posts: 107
Joined: Tue Aug 16, 2011 9:57 pm

EFI requires GPT

Post by skipro »

Lenovo T430, Win 10 Pro 64.
Previously installed BIBM and Win10 [several] to SSD, no issue with EMBR. Works fine.
Want to do same with a larger standard SATA HD. Get message with install "Disk has a MBR partition table, on EFI systems Win can only be installed on a GPT disk." If I change to GPT it installs, but then BIBM does not work as boot system.
Why is this happening to this disk but not the other disk? No changes to BIOS/UEFI.
Anyway to get around this?
Last edited by skipro on Tue May 10, 2016 8:41 pm, edited 1 time in total.
Brian K
Posts: 2213
Joined: Fri Aug 12, 2011 1:11 am
Location: NSW, Australia

Re: EFI requires GPT

Post by Brian K »

skipro wrote:

> Want to do same with a larger standard SATA HD.

Out of interest, what size is the HD?
skipro
Posts: 107
Joined: Tue Aug 16, 2011 9:57 pm

Re: EFI requires GPT

Post by skipro »

Standard disk is under 2T, 500G.
Brian K
Posts: 2213
Joined: Fri Aug 12, 2011 1:11 am
Location: NSW, Australia

Re: EFI requires GPT

Post by Brian K »

Check your BIOS has..

CSM enabled
Secure Boot... Other OS
skipro
Posts: 107
Joined: Tue Aug 16, 2011 9:57 pm

Re: EFI requires GPT

Post by skipro »

Thanks Brian, but why does it work with SSD?
Brian K
Posts: 2213
Joined: Fri Aug 12, 2011 1:11 am
Location: NSW, Australia

Re: EFI requires GPT

Post by Brian K »

Maybe the BIOS settings changed. Can you confirm the CSM and Secure Boot settings?
Brian K
Posts: 2213
Joined: Fri Aug 12, 2011 1:11 am
Location: NSW, Australia

Re: EFI requires GPT

Post by Brian K »

skipro,

I just replicated your issue and saw this message..

"Windows cannot be installed to this disk. The selected disk has a MBR partition table. On EFI systems, Win can only be installed to GPT disks."

I had a MBR disk with a primary, active partition
CSM... disabled
Secure Boot... Windows UEFI mode
Booted Win10 UFD in UEFI mode
TeraByte Support
Posts: 3596
Joined: Thu May 05, 2011 10:37 pm

Re: EFI requires GPT

Post by TeraByte Support »

Boot the installation media in normal mode and not UEFI mode. The disk can
boot in either mode, you should get a selection of what mode to boot in from
the BIOS provided the CSM is enabled.

"skipro" wrote in message news:11480@public.bootitbm...

Lenovo T430, Win 10 Pro 64.
Previously installed BIBM and Win10 [several] to SSD, no issue with EMBR.
Works fine.
Want to do same with a larger standard SATA HD. Get message with install
"Disk has a MBR partition table, on EFI systems Win can only be installed on
a GPT disk." If I change to GPT it installs, but then BIBM does not work as
boot system.
Why is this happening to this disk but not the other disk? No changes to
BIOS/UEFI.
Anyway to get around this?

skipro
Posts: 107
Joined: Tue Aug 16, 2011 9:57 pm

Re: EFI requires GPT

Post by skipro »

Thanks everyone for replying.
Setup:
Secure Boot disabled
CSM enabled
UEFI/Legacy Boot option - Both
Boot Priority - Legacy first

Now I get the same GPT request with Win10 installation UFD with the SSD.

I do not get an option to boot in either normal or UEFI mode, the boot choices are:
CD
HHD
USB Lexar [Win10 installation medium]
LAN

If I change Boot option to Legacy only, the UFD will not boot.
TeraByte Support
Posts: 3596
Joined: Thu May 05, 2011 10:37 pm

Re: EFI requires GPT

Post by TeraByte Support »

use the DVD.

Here's from MS Site:

For example, if you receive the error message: “Windows cannot be installed
to this disk. The selected disk is not of the GPT partition style”, it’s
because your PC is booted in UEFI mode, but your hard drive is not
configured for UEFI mode. You’ve got a few options:

1.. Reboot the PC in legacy BIOS-compatibility mode. This option lets you
keep the existing partition style. For more info, see Boot to UEFI Mode or
Legacy BIOS mode.


2.. Reformat the drive for UEFI by using the GPT partition style. This
option lets you use the PC’s UEFI firmware features.

You can do this yourself by reformatting the drive using the instructions
below, or if you need to preserve the data, use a third-party utility to
convert the drive to GPT format.



"skipro" wrote in message news:11489@public.bootitbm...

Thanks everyone for replying.
Setup:
Secure Boot disabled
CSM enabled
UEFI/Legacy Boot option - Both
Boot Priority - Legacy first

Now I get the same GPT request with Win10 installation UFD with the SSD.

I do not get an option to boot in either normal or UEFI mode, the boot
choices are:
CD
HHD
USB Lexar [Win10 installation medium]
LAN

If I change Boot option to Legacy only, the UFD will not boot.

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