You will need ms-sys to write a Master Boot Record (MBR) to the USB drive.
Make sure you have installed the…
…repository packages in order to compile the source code.
Download the latest source code from http://ms-sys.sourceforge.net/
Un-tar the source code and change into the source code directory:
tar xvzf ms-sys*
cd ms-sys-2.7.0
Compile and install the binary:
make
sudo make install
ms-sys will install to /usr/local/bin. Be sure to add this path if it is not in the root user’s environment PATH:
su -
export PATH=$PATH:/usr/local/bin
Once you have gparted installed, launch it from application launcher, click on dropdown menu in top right corner and select your external USB drive. Make sure that you have selected the correct drive and then click on the “Device” menu. Click on “Create Partition Table…” to completely format the drive.
On the next screen, ensure that the “partition table type” is “msdos” and click on the “Apply” button.
Once the partition table has been created, right click on unallocated space and click on “New” menuentry.
In the “File system:” dropdown menu, select “ntfs” and click on the “Add” button.
Next, click on the green tick button on the top toolbar to apply the changes.
Run “ms-sys -n” on the partition…
ms-sys -n /dev/sdX1
…and “ms-sys -7” on the whole USB device itself
ms-sys -7 /dev/sdX
Mount the USB Drive
sudo mkdir -p /mnt/flash
sudo mount /dev/sdX1 /mnt/flash
Mount the Windows ISO
sudo mkdir -p /mnt/iso
sudo mount -o loop /tmp/windows.iso /mnt/iso
Copy the Contents of the Windows ISO to the USB Drive
sudo cp -av /mnt/iso/* /mnt/flash/
Unmount the USB Drive
sudo umount /mnt/flash
Plugin the USB drive to the computer you want to install Windows on and boot to USB-HDD or USB-ZIP.