Create Bootable USB Flash Drive to Install Windows 10  

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  1. Posts : 358
    Windows 10
       #370

    NavyLCDR said:
    It ensures that you get a USB flash drive that is universally bootable in both UEFI and Legacy BIOS (or CSM mode) computers. It gets you back to a point where you have no questions as to exactly how the USB flash drive is partitioned and formatted.
    Itīs not clear to me what the difference is. When I format with FAT32, the drive is initialized as MBR, a partition is created and itīs set as "active".
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  2. Brink's Avatar
    Posts : 56,333
    64-bit Windows 10 Pro for Workstations build 21359
    Thread Starter
       #371

    Anibor said:
    Itīs not clear to me what the difference is. When I format with FAT32, the drive is initialized as MBR, a partition is created and itīs set as "active".
    The outlined steps just make sure that happens. Depending on how the USB was previously formatted, it may not turn out that way unless all the steps were done.

    Basically, just a precaution.
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  3. Posts : 3
    7
       #372

    Huge help, thank you.
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  4. Brink's Avatar
    Posts : 56,333
    64-bit Windows 10 Pro for Workstations build 21359
    Thread Starter
       #373

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  5. Brink's Avatar
    Posts : 56,333
    64-bit Windows 10 Pro for Workstations build 21359
    Thread Starter
       #374

    Update:

    Media Creation Tool (MCT) updated for Windows 10 build 18362.239.
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  6. Posts : 4
    Windows 10
       #375

    I did use Rufus do that and it worked.
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  7. sportsfan148's Avatar
    Posts : 971
    Windows 10 Home 202H
       #376

    Hi, Its great to see the new addition of Option 4...the manual method using Diskpart
    After getting an error message a couple of times when using the MCT Ive recently started using this Diskpart method instead to prepare the USB flash drive and create the bootable media. I only use the Media Creation Tool now to download the ISO.
    Reading through all the steps listed for Option 4 in the tutorial, I was surprised to see an extra command directly after the clean command, "convert mbr". Is this now a requirement to type in convert mbr?
    At the top of the Option 4 method it shows a reference link to a Microsoft Document and there is no mention in that document of typing in convert mbr.
    Ive previously followed other users advice on here and the commands Ive always been given and used are exactly the same as Option 4 ...but without the convert mbr command.
    I always thought that when you use the clean command, it wipes off all data, formatting and also the partition table. The next command I type is create partition primary which I thought also creates the mbr. Have I got that right?..or have I been making a mistake by not typing in convert mbr after the clean command?
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  8. cereberus's Avatar
    Posts : 12,014
    Windows10
       #377

    I use option 5 (yet to be written ) for UEFI

    1) format flash drive as fat32

    2) download and mount iso as a drive

    3) copy files from mounted drive to flash drive

    If legacy bios, you set partition active using diskpart (subset of option 4).
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  9. sportsfan148's Avatar
    Posts : 971
    Windows 10 Home 202H
       #378

    cereberus said:
    I use option 5 (yet to be written ) for UEFI

    1) format flash drive as fat32

    2) download and mount iso as a drive

    3) copy files from mounted drive to flash drive

    If legacy bios, you set partition active using diskpart (subset of option 4).
    Yeah..Ive used that method too in the past when Im certain there are no issues with the flash drive because I have a UEFI PC butI also use the Option 4 method and I wonder if I haven't been doing it correctly because I never type convert mbr after clean so Im wondering if its optional or mandatory now for some reason
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  10. cereberus's Avatar
    Posts : 12,014
    Windows10
       #379

    sportsfan148 said:
    Yeah..Ive used that method too in the past when Im certain there are no issues with the flash drive because I have a UEFI PC butI also use the Option 4 method and I wonder if I haven't been doing it correctly because I never type convert mbr after clean so Im wondering if its optional or mandatory now for some reason
    By default, usb drives are normally MBR based. Sometimes one is previously gpt formatted and depending on pc and OS bit type, it may not boot especially on a UEFI pc.

    By converting to MBR, the flash drive is more "universal" and will boot on legacy bios or UEFI.
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