How to convert bootable USB into an ISO file

Converting an ISO into a bootable USB or DVD is fairly easy.

The following apply when doing this conversion:

.iso to USB:

Use software like and the steps are simple.

.iso to DVD: 

Use software like ImgBurn.

What’s less familiar, hence the reason for this blog post, is how to convert a bootable USB to an .iso image file for later re-use.

The instructions for USB to .iso are as follows (for a Windows 7 installation for example):

  1. Install ImgBurn. You can even get a portable version of it, just search for it.
  2. Plug the bootable USB into the computer
  3. Start ImgBurn.
  4. Click on the “Create image file from files / folders” button on the home menu.
  5. In “Sources” browse to the USB drive.
  6. In “Destination” choose where to save the final .iso image.
  7. Go to the “Advanced” tab on the right and then “Bootable Disk”.
  8. Check the box “Make Bootable Image” and then, in the “Boot image” box browse to file “” that is in the USB stick found in the folder “boot”.
  9. In the field “Developer ID” put “Microsoft Corporation” and enter “07C0” in the “Load Segment” field.
  10. Enter ‘4’ in the ‘Sectors To Load’ field if your file is 2K is size, enter ‘8’ if it’s 4K. In other words, x = size of in bytes / 512.
  11. Click “Build” and you’re done!

6 Comments (+add yours?)

  1. gordon
    Oct 31, 2013 @ 13:57:05

    Thanks! worked a treat for me. Very handy for installing VMs from USB stick images in VMWare Player.


  2. Alexey Perepelkin
    Nov 04, 2013 @ 23:04:17

    Cool, thanks


  3. kidator
    Nov 05, 2013 @ 00:37:58

    Thanks i’ll try it, 🙂 !


  4. Chris Bethel
    Feb 11, 2014 @ 03:57:09

    Awesome. This did exactly what I needed.


  5. Sameer
    May 07, 2014 @ 09:44:33

    Thanks… Really very good… It worked for me…


  6. Bryan Swedhin
    Sep 05, 2014 @ 20:28:39

    In Attempt to build iso file using bootmgr file or did not work. I am attempting to build a WinPE boot CD. while using bootmgr file system hangs/freezes at black screen with flashing cursor unable to type any commands. While using file system errors unable to find bootmgr. any othter suggestions?


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