Use MCT to create bootable Flash drive with previously downloaded ISO

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  1. ricardobohner's Avatar
    Posts : 302
    Windows 10
       #1

    Use MCT to create bootable Flash drive with previously downloaded ISO


    Hi, I would like to know if it is possible to use Media Creation Tool (MCT) to create a bootable USB Flash Drive from a previously downloaded ISO image.

    I already downloaded the ISO image some time ago with MCT when it was finished with the download it asked if I would like to burn a DVD, save the ISO or create a bootable USB Flash drive. I choosed save ISO. Now I want to know If I could make bootable Flash drive using MCT without having to re-download Windows 10.

    I think by normal means MCT doesn't do this but maybe there is tweak :)
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  2. Bree's Avatar
    Posts : 19,104
    10 Home x64 (20H2) (10 Pro on 2nd pc)
       #2

    No, you can't use the MCT to do this. But you don't need to, it's easy to do it yourself.

    First prepare the USB. It needs to be at least 8GB. It needs to be formatted with Fat32 and (to allow it to boot on legacy bios systems) its partition should be marked as Active. You can usually use Disk Management to mark it as active by right-clicking on it's partition.

    Then just double-click on the ISO file to mount it as a virtual DVD drive, select all the files and folders you see there and copy them to the USB. This USB is now bootable and identical to the USB that the MCT would have created.

    A few USBs are partitioned in a way that doesn't allow you to mark it as active. If so, use Diskpart to prepare the USB, starting with the CLEAN command to remove all previous partition info from the USB (you can run Diskpart by typing DISKPART in a command prompt or in the WniKey+R run box). In this example the USB is disk 1, use LIST DISK first to find the number of yours.

    Code:
    Microsoft DiskPart version 10.0.16299.15
     Copyright (C) Microsoft Corporation.
    
     DISKPART> LIST DISK
    
       Disk ###  Status         Size     Free     Dyn  Gpt
       --------  -------------  -------  -------  ---  ---
       Disk 0    Online          465 GB      0 B
       Disk 1    Online         7634 MB      0 B
    
     DISKPART> SELECT DISK 1
     Disk 1 is now the selected disk.
    
     DISKPART> CLEAN
     DiskPart succeeded in cleaning the disk.
    
     DISKPART> CREATE PARTITION PRIMARY
     diskPart succeeded in creating the specified partition.
    
     DISKPART> SELECT PARTITION 1
     Partition 1 is now the selected partition.
    
     DISKPART> FORMAT FS=FAT32 QUICK
       100 percent completed
     DiskPart successfully formatted the volume.
    
     DISKPART> ACTIVE
     diskPart marked the current partition as active.
    
     DISKPART> EXIT
    Last edited by Bree; 20 Apr 2018 at 18:37.
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  3. Posts : 913
    CP/M
       #3

    ricardobohner said:
    Hi, I would like to know if it is possible to use Media Creation Tool (MCT) to create a bootable USB Flash Drive from a previously downloaded ISO image.
    Use Rufus instead the MCT. And for successful boot of SecureBoot & UEFI systems, do not forget to change filesystem to FAT32.
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  4. Phone Man's Avatar
    Posts : 1,320
    Windows 10 Pro 1909 64 bit
       #4

    Use Option Two in this Tutorial to use Rufus.

    Create Bootable USB Flash Drive to Install Windows 10

    Jim
      My Computer

  5. NavyLCDR's Avatar
    Posts : 15,582
    Windows 10 Pro
       #5

    Use @Bree's method in post #2.
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  6. ricardobohner's Avatar
    Posts : 302
    Windows 10
    Thread Starter
       #6

    Thank you,

    I remember that in the "Microsoft way" for creating a bootable instalation media in Windows 8 there was included one more step:

    After preparing the boot media with diskpart go to the source files (let's say d: are the source files and e: is you flash USB drive)

    CD d:\boot
    Bootsect /nt60 e:


    After that you could copy the instalation files to the USB flash drive. Is this step not necessary anymore?
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  7. Bree's Avatar
    Posts : 19,104
    10 Home x64 (20H2) (10 Pro on 2nd pc)
       #7

    ricardobohner said:
    ...I remember that in the "Microsoft way" for creating a bootable instalation media in Windows 8 there was included one more step...
    CD d:\boot
    Bootsect /nt60 e:
    After that you could copy the instalation files to the USB flash drive. Is this step not necessary anymore?
    Actually the MS way seems to be the other way round, first copy the files to the USB then use Bootsect...

    TechNet | Step-By-Step: Prepare USB Media to Install Windows 10 (April 2015)

    As it happens, last week I made a Win 8.1 install USB by copying the files from a DVD that itself had been burned from an ISO made by the Win 8 MCT. I didn't use the Bootsect command and that boots fine on my legacy bios systems.

    Apparently...
    bootsect /nt60 sys
    The bootsect command as used above will update the volume boot code on the partition used to boot Windows to BOOTMGR, the one that's compatible with Windows Vista, Windows 7, Windows 8, Windows 10...
    How to Use Bootsect /nt60 to Update the VBC to BOOTMGR

    ...so the fact that my USB booted without being updated suggests it's a redundant opperation.

    I don't have a uefi system to test my USB on, perhaps @NavyLCDR could comment on that?
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  8. topgundcp's Avatar
    Posts : 2,774
    Linux Mint 20.1 Win10Prox64
       #8

    After preparing the boot media with diskpart go to the source files (let's say d: are the source files and e: is you flash USB drive)

    CD d:\boot
    Bootsect /nt60 e:
    You only need this if the master boot code in the USB is corrupted or in some case, you use an old USB stick with out of date firmware and unable to boot.

    FYI, After you prepare the USB stick ie.
    1. Format with FAT32 if your UEFI firmware is prior to version 2.0, else you can format with NTFS.
      NOTE: Format with NTFS will remove the 4GB restriction so you won't have any problem with install.wim/install.esd exceeding 4GB file size.
    2. set Active if you are planning to install Windows using MBR disk type else you don't need to.
    3. Instead of mounting and copy. You can extract the content of the ISO file using WinRAR/WinZip/7-zip
      OR You can also use command line with 7-Zip:
      7z.exe x Windowsx64.iso -o"F:" -y where F: is the drive letter of the USB
      NOTE: step 1 & 2 are needed for first time to prepare the USB. Any subsequent update, only need step 3.
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  9. ricardobohner's Avatar
    Posts : 302
    Windows 10
    Thread Starter
       #9

    Ok, thanks everyone for the explanations.
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  10. Try3's Avatar
    Posts : 7,632
    Windows 10 Home x64 Version 20H2 Build 19042.928
       #10

    Ricardo,

    I agree with the others and would like to add one extra ditty.

    Once you have made your Windows 10 installation disk from this ISO on this occasion, you can in the future delete all files then copy across the contents of a new ISO [by, as the others said, mounting it or just opening in WinZip etc].
    - You do not need to start from scratch with DiskPart every time you want an updated installation USB.
    - I have been doing this since about Ver 1511 and my installation disk works well for clean installations & repair installs.
    - I go a bit further and hide the contents so that I can also use the install USB for other important files without risking accidentally overwriting any of the Windows 10 installation files. The install USB is perfectly happy to be used in this way.

    Denis
      My Computer


 
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