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

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  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
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  3. NavyLCDR
    Posts : 18,467
    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?
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  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.
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  6. NavyLCDR
    Posts : 18,467
    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?
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  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.
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  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)
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  9. NavyLCDR
    Posts : 18,467
    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.
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  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
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  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.
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  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
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