If you have a Windows ISO, you can use the Windows 7 USB/DVD Tool to create a bootable Windows installation image on a USB drive. But what if you want to create a bootable USB installation image from a DVD or CD ROM? You can do it by following these steps:

Plus your USB disk in to your computer and your image CD/DVD into the CD/DVD drive. Next, open a command prompt.

At the command prompt, type the following:

diskpart

list disk

image

Locate the USB drive (in this example, it’s Disk 1) and then type:

select disk 1 (or whatever disk number that your USB disk is assigned)

clean

create partition primary

select partition 1

active

format fs=ntfs quick

assign

exit

robocopy.exe d:\ e:\ /mir (assuming d: is your cd rom and e: is your newly created USB disk)

When the process is finished, you will have a bootable Windows Image on a USB flash device!

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