Use fdisk on your USB drive to create a bootable NTFS partition (in my case /dev/sdb):

 sudo fdisk /dev/sdb

Welcome to fdisk (util-linux 2.27.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.



Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-30218841, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-30218841, default 30218841):

Created a new partition 1 of type 'Linux' and of size 14.4 GiB.




Command (m for help): t

Command (m for help): t
Selected partition 1
Partition type (type L to list all types): 7
Changed type of partition 'NTFS volume set' to 'HPFS/NTFS/exFAT'.

Command (m for help): a

Selected partition 1
The bootable flag on partition 1 is enabled now.




Command (m for help): wq
The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: Device or resource busy

The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8).




Disk /dev/sdb: 14.4 GiB, 15472047104 bytes, 30218842 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x45b30652

Device     Boot Start      End  Sectors  Size Id Type
/dev/sdb1  *     2048 30218841 30216794 14.4G  7 HPFS/NTFS/exFAT


Make an NTFS fs on /dev/sdb1

sudo mkfs -t ntfs /dev/sdb1
Cluster size has been automatically set to 4096 bytes.
Initializing device with zeroes: 100% - Done.
Creating NTFS volume structures.
mkntfs completed successfully. Have a nice day.
 

Now copy the iso to your partition (in my case /dev/sdb1)

sudo mount -o loop windows.iso mountpoint


cp -a mountpoint/* /mnt/sdb1/

Now put an MBR on it:

sudo dd if=/usr/lib/syslinux/mbr/mbr.bin of=/dev/sdb

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