drive needs to be formatted as GPT but BIOS is legacy and not UEFI

Page 1 of 2 12 LastLast

  1. Nash04
    Posts : 11
    WIN 7 PRO
       New #1

    drive needs to be formatted as GPT but BIOS is legacy and not UEFI


    I'm basically having a similar issue where I'm trying install a clean W10 onto my previous SSD and Win10 does see the drives and starts loading but stops whiting a few seconds stating that my drive needs to be formatted as GPT but BIOS is legacy and not UEFI. Perform Diskpart and clean the drive then created a primary partition and it's listed as so but RAW and not NTFS or FAT32? What could be causing this issue. Now Win7 was previously installed onto that drive but should be gone since I perform a CLEAN on it, correct? Thanks
      My Computer
    Quote Quote

  3. NavyLCDR
    Posts : 18,432
    Windows 11 Pro
       New #2

    Nash04 said:
    I'm basically having a similar issue where I'm trying install a clean W10 onto my previous SSD and Win10 does see the drives and starts loading but stops whiting a few seconds stating that my drive needs to be formatted as GPT but BIOS is legacy and not UEFI. Perform Diskpart and clean the drive then created a primary partition and it's listed as so but RAW and not NTFS or FAT32? What could be causing this issue. Now Win7 was previously installed onto that drive but should be gone since I perform a CLEAN on it, correct? Thanks
    Are you sure your BIOS is legacy? Windows setup will only require a GPT partitioned drive if the Windows installation media is booted into in UEFI mode. What did you use to create your Windows 10 installation media with... I'll bet RUFUS?
      My Computer
    Quote Quote

  4. Nash04
    Posts : 11
    WIN 7 PRO
    Thread Starter
       New #3

    NavyLCDR said:
    Are you sure your BIOS is legacy? Windows setup will only require a GPT partitioned drive if the Windows installation media is booted into in UEFI mode. What did you use to create your Windows 10 installation media with... I'll bet RUFUS?
    I used the Windows installer program which created a bootable USB drive.
      My Computer
    Quote Quote

  6. NavyLCDR
    Posts : 18,432
    Windows 11 Pro
       New #4

    Your specs say Sabretooth 990FX R2 motherboard with Windows 7. Did you then upgrade that Windows 7 to Windows 10? And are we talking about the same computer?
      My Computer
    Quote Quote

  7. Nash04
    Posts : 11
    WIN 7 PRO
    Thread Starter
       New #5

    NavyLCDR said:
    Your specs say Sabretooth 990FX R2 motherboard with Windows 7. Did you then upgrade that Windows 7 to Windows 10? And are we talking about the same computer?
    No, I perform a clean W10 install on my old SSD drive, Win7 is installed on my new SSD drive but is disconnected while trying to install W10 on the old SSD drive. I verified my BIOS and it's legacy.
      My Computer
    Quote Quote

  8. Nash04
    Posts : 11
    WIN 7 PRO
    Thread Starter
       New #6

    Nash04 said:
    No, I perform a clean W10 install on my old SSD drive, Win7 is installed on my new SSD drive but is disconnected while trying to install W10 on the old SSD drive. I verified my BIOS and it's legacy.
    This is what Belarc is displaying:
    Boot Mode: Legacy BIOS in UEFI (Secure Boot not supported)
      My Computer
    Quote Quote

  9. NavyLCDR
    Posts : 18,432
    Windows 11 Pro
       New #7

    Nash04 said:
    No, I perform a clean W10 install on my old SSD drive, Win7 is installed on my new SSD drive but is disconnected while trying to install W10 on the old SSD drive. I verified my BIOS and it's legacy.
    Well - you might have the option set for booting in legacy mode - but that is only an option. Since the motherboard has a UEFI firmware (mistakenly referred to as BIOS), it will boot by default in UEFI mode when it finds something capable of booting in UEFI mode. It is booting the USB flash drive in UEFI mode. If you really want to stick with CSM (legacy BIOS) mode, then you need to select the specific entry in the boot override menu for booting the USB flash drive in CSM mode - it should be the entry for the flash drive that only points to the actual flash drive itself, and not anything that mentions an OS on the flash drive.

    Or, do the clean command on the SSD. Do not do anything else, just stop after the clean command. Then install Windows to the unallocated space on the SSD, with no other drives connected. That SSD will then boot in UEFI mode.
      My Computer
    Quote Quote

  10. Nash04
    Posts : 11
    WIN 7 PRO
    Thread Starter
       New #8

    NavyLCDR said:
    Well - you might have the option set for booting in legacy mode - but that is only an option. Since the motherboard has a UEFI firmware (mistakenly referred to as BIOS), it will boot by default in UEFI mode when it finds something capable of booting in UEFI mode. It is booting the USB flash drive in UEFI mode. If you really want to stick with CSM (legacy BIOS) mode, then you need to select the specific entry in the boot override menu for booting the USB flash drive in CSM mode - it should be the entry for the flash drive that only points to the actual flash drive itself, and not anything that mentions an OS on the flash drive.

    Or, do the clean command on the SSD. Do not do anything else, just stop after the clean command. Then install Windows to the unallocated space on the SSD, with no other drives connected. That SSD will then boot in UEFI mode.
    Will try that later today, it's time for the old man to do some exercise, riding the old MTB.
    Thanks for the info
      My Computer
    Quote Quote

  12. Nash04
    Posts : 11
    WIN 7 PRO
    Thread Starter
       New #9

    Nash04 said:
    Will try that later today, it's time for the old man to do some exercise, riding the old MTB.
    Thanks for the info
    Sorry about taken so long to reply, the "BOSS" wanted to go out for dinner after she gave me a "KitchenPass"
    Perform a clean install on my old SSD and it finally worked. Now I would like to set it up as a Dual boot since I've numerous software applications on my 7 and also have installed virtual Linux for training.
    Is there a way to set it up as Dual boot. My buddy told me to just switch between them by unplugging/plugging the power cable.....
    Thanks again for the help.
      My Computer
    Quote Quote

  13. Nash04
    Posts : 11
    WIN 7 PRO
    Thread Starter
       New #10

    Nash04 said:
    Sorry about taken so long to reply, the "BOSS" wanted to go out for dinner after she gave me a "KitchenPass"
    Perform a clean install on my old SSD and it finally worked. Now I would like to set it up as a Dual boot since I've numerous software applications on my 7 and also have installed virtual Linux for training.
    Is there a way to set it up as Dual boot. My buddy told me to just switch between them by unplugging/plugging the power cable.....
    Thanks again for the help.
    Never mind, found your post about Dual booting, thanks
      My Computer
    Quote Quote

 

  Related Discussions
BIOS mode as Legacy or UEFI?
in Installation and Upgrade

My Windows 10 says its BIOS mode is Legacy with C drive partition as MBR. Is it worth switching to UEFI mode with C drive as GPT partition? Why does it seem so difficult to install to UEFI mode with GPT partition? You do not get an option to choose...
Hi All, Had a few problems with a driver that messed up this machine. All sorted, but have had intermittent boot issues ever since. Sometimes it doesn't boot correct, showing the Windows "preparing automatic repair screen!. I then go to...
I used the Windows converting program MBR2GPT.exe to convert my SSD to GPT and it reported it had done it. I then rebooted and entered the bios and changed one setting from Legacy ROM to EFI Compatible ROM and another setting called 'UEFI Boot' from...
Hello, I've installed Windows 10 and Ubuntu using UEFI. But, now I created a bootable USB for a Linux that does not support UEFI, but only Legacy. I mean, when I plug the USB to my laptop, the UEFI does not recognize it, only the Legacy BIOS...
EFI, UEFI, Legacy BIOS.......
in Installation and Upgrade

This weekend I will try to do a clean install of Win 10 again, from Win 7. Have to try som new methods to see if I can get my computer running flawlessly with Windows 10. I will use the clean install tutorials from this forum. I hav two options,...
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

 © Designer Media Ltd
All times are GMT -5. The time now is 02:49.
Find Us




Windows 10 Forums