Create a bootable USB pen drive of Windows OS ISO

bootable-usb-windows.sh

#!/bin/bash

# create a GPT partition table and a FAT32 partition
sudo sgdisk --zap-all /dev/sdb
sudo sgdisk --new=1:0:0 --typecode=1:ef00 /dev/sdb
sudo mkfs.vfat -F32 -n GRUB2EFI /dev/sdb1

# mount the partition
sudo mount -t vfat /dev/sdb1 /mnt -o uid=1000,gid=1000,umask=022

# install GRUB2
sudo grub-install --removable --boot-directory=/mnt/boot --efi-directory=/mnt/EFI/BOOT /dev/sdb

# mount Windows ISO
mount -o loop windows.iso /media/cdrom

# copy all Windows installation files
cp -r /media/cdrom/* /mnt

# umount the partition
umount /mnt