How to make active@boot disk bootable on uefi/gpt?

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  1. Posts : 7,456
    Windows 10 Home 20H2
       #21

    Hydranix said:
    Also, if you are attempting to boot this flash drive in UEFI mode, you'll want to use FAT32
    FAT32 applies to both UEFI BIOS and Legacy BIOS, right?

    Hydranix said:
    Have you tried actually booting the flash drive?
    No. I want to use it to clean install Redstone 2 later.
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  2. Posts : 201
    Kernel 4.x.x
       #22

    Matthew Wai said:
    FAT32 applies to both UEFI BIOS and Legacy BIOS, right?
    Yes, that is correct. By using FAT32, you can boot in either Legacy mode, or UEFI mode if supported, and the flash drive contains both UEFI and Legacy boot files.

    Matthew Wai said:
    No. I want to use it to clean install Redstone 2 later.
    Then I would suggest backing up the data on the drive and doing a full wipe to avoid any problems.

    After the data has been backed up
    Code:
    diskpart
    sel dis #
    cle all
    cre par pri
    format fs=fat32 quick
    act
    ass letter=s
    exit
    bootsect /nt60 S: /force
    bootsect /nt60 S: /force /mbr
    copy over data and everything should work as expected
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  3. Posts : 7,456
    Windows 10 Home 20H2
       #23

    Hydranix said:
    bootsect /nt60 S: /force
    bootsect /nt60 S: /force /mbr
    The above does not exist in post #7, so I did not run them. Why are they needed?
    Before you wrote post #22, I had already done the following.
    Is the USB drive bootable now?



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  4. Posts : 4,560
    Windows 10 Pro
       #24

    But there`s no iso file on it, is there ?

    I still don`t understand what people are trying to do here, are you trying to make a bootable usb to run windows 10 off of ?

    Or are you trying to make a bootable usb to install windows 10 off of ?
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  5. Posts : 7,456
    Windows 10 Home 20H2
       #25

    I want to make a bootable USB drive to clean install the upcoming version of Windows 10.
      My Computer


  6. Posts : 201
    Kernel 4.x.x
       #26

    Matthew Wai said:
    I want to make a bootable USB drive to clean install the upcoming version of Windows 10.
    This threads was originally concerning a UEFI-mode bootable flash drive. So I answered you under the assumption that you wanted to make a flash drive UEFI bootable.

    Then you said:

    Matthew Wai said:
    FAT32 applies to both UEFI BIOS and Legacy BIOS, right?
    So I added the extra bootsect commands which make the drive Legacy-mode bootable. So that you would have a flash drive which can do both.

    I originally omitted the Legacy-mode steps because I've had many experiences of people mistakenly installing Windows on modern hardware in Legacy mode, and using the CSM (which slows down the boot process and places limitations on the OS to some degree) rather than in UEFI-mode, and since the IBM PC BIOS (aka Legacy BIOS) is entirely deprecated, I assume UEFI is what people want by default.


    Matthew Wai said:
    Is the USB drive bootable now?
    In UEFI-mode it will boot if the contents of the Windows 10 ISO, not the ISO file itself, but what it contains, are copied to the flash drive.

    If you want to also have the option to Legacy boot the flash (not recommended unless you know you need it to be) you will have to run the bootsect command to write the Legacy boot code to the flash drive. Of course the ISO contents will need to be copied to the flash drive as well, like I said above.


    I hope I wasn't unclear, sorry if I over explain things a bit.
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  7. Posts : 7,456
    Windows 10 Home 20H2
       #27

    Hydranix said:
    So I added the extra bootsect commands which make the drive Legacy-mode bootable.
    No bootsect commands are needed in the method described in post #7, which applies to both UEFI and Legacy mode. Why are bootsect commands needed in my case?

    I use an MBR disk, so I have to use the Legacy mode, but I might go over to GPT in the future.
      My Computer


  8. Posts : 201
    Kernel 4.x.x
       #28

    Matthew Wai said:
    No bootsect commands are needed in the method described in post #7, which applies to both UEFI and Legacy mode. Why are bootsect commands needed in my case?

    I use an MBR disk, so I have to use the Legacy mode, but I might go over to GPT in the future.
    the bootsect commands are unnecessary if not using Legacy mode. However, in your case, since you're using MBR partition table, and do not at this time want to move to a GPT, you'll need to use the bootsect commands on the flash drive.

    I'd strongly advise, if your motherboard firmware is UEFI capable, to use a GPT formatted hard drive, and installing windows in UEFI mode, and disabling Legacy Emulation in your firmware (aka the Compatibility Support Module).
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  9. Posts : 7,456
    Windows 10 Home 20H2
       #29

    On MCT, should I select 'USB flash drive' or 'ISO file' for my bootable USB drive?

    My ASUS motherboard supports UEFI, but my HDD is just 500 GB, so I don't see why I should use GPT, as I have been using MBR happily for years.
      My Computer


  10. Posts : 4,560
    Windows 10 Pro
       #30

    I choose Iso file, so you can create the usb stick or a dvd whenever you want, and you now have the Iso file permanently.

    It`s so much easier to let Rufus create either type of installer.

    I use MBR too, I`ve seen no benefit to using UEFI on a boot drive, and I like 1 single partition.
      My Computers


 

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