Lenovo T430, Win 10 Pro 64.
Previously installed Win10 [several] to SSD, no issues with MBR. Works fine.
Want to do same with a larger standard SATA HD. Get message when installing “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.
I want to use MBR.
Why is this happening to this disk [requiring GPT] but not the other disk? No changes to BIOS/UEFI.
Anyway to get around this?
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EFI requires GPT
Home » Forums » AskWoody support » Windows » Windows 10 » Questions: Win10 » EFI requires GPT
- This topic has 13 replies, 5 voices, and was last updated 9 years ago.
AuthorTopicWSskipro
AskWoody LoungerMay 10, 2016 at 4:15 pm #505555Viewing 3 reply threadsAuthorReplies-
bbearren
AskWoody MVPMay 10, 2016 at 4:25 pm #1563232Lenovo T430, Win 10 Pro 64.
Previously installed Win10 [several] to SSD, no issues with MBR. Works fine.
Want to do same with a larger standard SATA HD. Get message when installing “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.
I want to use MBR.
Why is this happening to this disk [requiring GPT] but not the other disk? No changes to BIOS/UEFI.
Anyway to get around this?[/QUOTE]
That you’re getting that warning indicates that you are actually running UEFI/GPT and not BIOS/MBR.To check on this, open an elevated Command Prompt (Run as administrator) and type (without the quotes) “diskpart” and Enter.
After diskpart opens, your pompt will change to DISKPART> Type (without the quotes) “list disk” and Enter. If you’re using UEFI/GPT you’ll see an asterisk under the GPT column, as in the following graphic.
Always create a fresh drive image before making system changes/Windows updates; you may need to start over!We all have our own reasons for doing the things that we do with our systems; we don't need anyone's approval, and we don't all have to do the same things.We were all once "Average Users".-
This reply was modified 6 years ago by
WSskipro.
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This reply was modified 5 years, 5 months ago by
bbearren.
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This reply was modified 6 years ago by
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WSskipro
AskWoody LoungerMay 11, 2016 at 12:21 pm #1563354bbearren,
Thanks for your reply. My system is running either UEFI/GPT or BIOS/MBR, not both and it does not change [unless it is schizophrenic], correct? If that is correct, I revert to my original conundrum.Win10 installed and runs on my SSD with MBR which is verified with diskpart, see attached. But when I replace the SSD with a conventional HD [under 2T] Win10 at installation says I have EFI and need GPT, obviously not saying this when installing on the SSD.
Why does a different HD cause this? Is there anything associated with the HDs that would effect this? It is the only variable other than a more current version of Win10. Is this a MS Win thing? -
bbearren
AskWoody MVPMay 11, 2016 at 6:21 pm #1563423bbearren,
Thanks for your reply. My system is running either UEFI/GPT or BIOS/MBR, not both and it does not change [unless it is schizophrenic], correct?UEFI can emulate BIOS, but a UEFI-based motherboard does not “have” BIOS; it only has UEFI. Motherboard manufacturers can implement UEFI in any number of configurations (just like there are a number of different implementations of BIOS, depending on the motherboard). A UEFI motherboard can run in “legacy” mode, emulating BIOS, but that is not true BIOS.
Always create a fresh drive image before making system changes/Windows updates; you may need to start over!We all have our own reasons for doing the things that we do with our systems; we don't need anyone's approval, and we don't all have to do the same things.We were all once "Average Users". -
CADesertRat
AskWoody PlusMay 11, 2016 at 8:00 pm #1563429UEFI can emulate BIOS, but a UEFI-based motherboard does not “have” BIOS; it only has UEFI. Motherboard manufacturers can implement UEFI in any number of configurations (just like there are a number of different implementations of BIOS, depending on the motherboard). A UEFI motherboard can run in “legacy” mode, emulating BIOS, but that is not true BIOS.
Good explanation. That’s exactly how I received my HP ProBook laptop.
Don't take yourself so seriously, no one else does
All W10 Pro at 22H2,(2 Desktops, 1 Laptop).
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Paul T
AskWoody MVP -
bbearren
AskWoody MVPMay 11, 2016 at 2:39 pm #1563370What OS was pre-installed on your Lenovo?
Always create a fresh drive image before making system changes/Windows updates; you may need to start over!We all have our own reasons for doing the things that we do with our systems; we don't need anyone's approval, and we don't all have to do the same things.We were all once "Average Users". -
WSskipro
AskWoody Lounger -
Berton
AskWoody_MVPMay 11, 2016 at 2:48 pm #1563372Win 7
32-bit or 64-bit?
http://www.sevenforums.com/tutorials/186875-uefi-unified-extensible-firmware-interface-install-windows-7-a.html
https://technet.microsoft.com/en-us/library/hh290675%28v=ws.10%29.aspx?f=255&MSPPError=-2147217396
http://www.tomshardware.com/answers/id-1912310/windows-supports-uefi-secure-boot.htmlBefore you wonder "Am I doing things right," ask "Am I doing the right things?" -
WSskipro
AskWoody LoungerMay 11, 2016 at 4:06 pm #1563389Berton,
64-bit
Thank you for tutorials to install Win7 within UEFI but I am not sure why since I am trying to install Win10 in MBR.bbearren,
I do not know why the original OS or my method to change to GPT [3rd party software] is applicable to my problem .
GPT is not my issue, avoiding it is.Restating problem:
I want to install Win10 in MBR.
BIOS set to boot both UEFI and Legacy
Boot order is Legacy first
Secure boot disabled
CSM enabled.
But Win10 installation UFD tells me I have an EFI system.
Boot menu does not offer me a “normal” or UEFI choice with USB
Only choice is USB which brings me back to “you have a EFI system.”
Where is my MBR option? -
bbearren
AskWoody MVPMay 11, 2016 at 6:11 pm #1563420bbearren,
I do not know why the original OS or my method to change to GPT [3rd party software] is applicable to my problem .
GPT is not my issue, avoiding it is.[/quote]
You didn’t answer my question.If I change to GPT it installs.
By what means do you “change to GPT”?[/QUOTE]
GPT and MBR are standards for disk partitioning and file allocation. They aren’t [third party software]. You have a UEFI system which has evidently been running in legacy mode.The answer to my question is relevant to your issue.
Restating problem:
I want to install Win10 in MBR.
BIOS set to boot both UEFI and Legacy
Boot order is Legacy first
Secure boot disabled
CSM enabled.
But Win10 installation UFD tells me I have an EFI system.
Boot menu does not offer me a “normal” or UEFI choice with USB
Only choice is USB which brings me back to “you have a EFI system.”
Where is my MBR option?[/QUOTE]
Depending on how UEFI has been implemented in your motherboard, you may not have an option to install Windows 10 on an MBR disk. All OEM installations since Windows 8 have required UEFI/GPT and Secure Boot. Windows 10 is very much aware of a UEFI motherboard.Always create a fresh drive image before making system changes/Windows updates; you may need to start over!We all have our own reasons for doing the things that we do with our systems; we don't need anyone's approval, and we don't all have to do the same things.We were all once "Average Users".
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bbearren
AskWoody MVPMay 11, 2016 at 3:58 pm #1563388If I change to GPT it installs.
By what means do you “change to GPT”?
Always create a fresh drive image before making system changes/Windows updates; you may need to start over!We all have our own reasons for doing the things that we do with our systems; we don't need anyone's approval, and we don't all have to do the same things.We were all once "Average Users".
Viewing 3 reply threads -

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