Create Bootable USB Flash Drive to Install Windows 10  

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  1. cereberus's Avatar
    Posts : 12,114
    Windows10
       #310

    It really is quite easy now to create a usb drive that will boot in uefi with install.wim > 4GB.

    This assumes you have a custom iso with customised install.wim

    1) Create two partitions from disk management
    a) fat32 size c. 1GB
    b) ntfs - rest of drive

    2) copy all files from iso to ntfs partition

    3) copy all files EXCEPT install.wim to fat32 partition.

    That's it.
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  2. Matthew Wai's Avatar
    Posts : 5,686
    Windows 10 Home 20H2
       #311

    cereberus said:
    2) copy all files from iso to ntfs partition
    Why not copy ONLY install.wim to the NTFS partition, as all other files will be copied to the FAT32 partition?

    cereberus said:
    a) fat32 size c. 1GB
    What does "c." stand for? The drive letter?
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  3. f14tomcat's Avatar
    Posts : 54,249
    Multi-boot Windows 10 - RTM, RP, Beta, and Insider
       #312

    Matthew Wai said:
    Why not copy ONLY install.wim to the NTFS partition, as all other files will be copied to the FAT32 partition?


    What does "c." stand for? The drive letter?
    Circa? "a) fat32 size approximately 1GB"

    Just guessing.
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  4. cereberus's Avatar
    Posts : 12,114
    Windows10
       #313

    Matthew Wai said:
    Why not copy ONLY install.wim to the NTFS partition, as all other files will be copied to the FAT32 partition?


    What does "c." stand for? The drive letter?
    For some reason, it does not always work with just install.wim. it only takes a few seconds extra to copy the lot.

    c. means approximately (it means circa - Latin). It is similar to e.g. or i.e.

    The abbreviation is used a lot in UK.
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  5. Matthew Wai's Avatar
    Posts : 5,686
    Windows 10 Home 20H2
       #314

    cereberus said:
    2) copy all files from iso to ntfs partition
    3) copy all files EXCEPT install.wim to fat32 partition.
    Done as you said above, but I got the following message when I booted it from the USB drive, whose first and second partitions are in FAT32 and NTFS respectively.



    Is this because I don't have the following?
    cereberus said:
    a custom iso with customised install.wim
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  6. f14tomcat's Avatar
    Posts : 54,249
    Multi-boot Windows 10 - RTM, RP, Beta, and Insider
       #315

    Why are you not using Option #2 and just run Rufus? It works. Now that you've got your Thumb drive partitioned in Fat32/NTFS, it may need to be put back to standard FAT32 only. Sometimes that can be hard to do, or impossible without tricky formatters.

    Some using 7-Zip to extract the ISO contents directly to the Thumb. Again, all FAT32 format.

    Some mount the ISO and copy to thumb. Again, all FAT32 format.
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  7. Matthew Wai's Avatar
    Posts : 5,686
    Windows 10 Home 20H2
       #316

    f14tomcat said:
    Why are you not using Option #2 and just run Rufus?
    Because Rufus will erase all files on my 28 GB USB drive.

    f14tomcat said:
    Now that you've got your Thumb drive partitioned in Fat32/NTFS, it may need to be put back to standard FAT32 only. Sometimes that can be hard to do, or impossible without tricky formatters.
    I am using a fake drive for testing, and it is very easy to reformat it. I have done so several times.
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  8. f14tomcat's Avatar
    Posts : 54,249
    Multi-boot Windows 10 - RTM, RP, Beta, and Insider
       #317

    Matthew Wai said:
    Because Rufus will erase all files on my 28 GB USB drive.

    I am using a fake drive for testing, and it is very easy to reformat it. I have done so several times.
    ok, was not aware all this was testing and the thumb was intended for multi-purpose.
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  9. Wynona's Avatar
    Posts : 28,366
    Windows 10 21H1 Build 19043.1023
       #318

    f14tomcat said:
    Why are you not using Option #2 and just run Rufus? It works. Now that you've got your Thumb drive partitioned in Fat32/NTFS, it may need to be put back to standard FAT32 only. Sometimes that can be hard to do, or impossible without tricky formatters.

    Some using 7-Zip to extract the ISO contents directly to the Thumb. Again, all FAT32 format.

    Some mount the ISO and copy to thumb. Again, all FAT32 format.
    Yup! I've used Rufus as long as I've been making my own ISOs. Follow the instructions and it just works.
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  10. Wynona's Avatar
    Posts : 28,366
    Windows 10 21H1 Build 19043.1023
       #319

    Matthew Wai said:
    Because Rufus will erase all files on my 28 GB USB drive.
    I bought four 8 GB USB drives for a few bucks and have dedicated those to my ISOs.

    Matthew Wai said:
    I am using a fake drive for testing, and it is very easy to reformat it. I have done so several times.
    Fake drive? What's that?
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