Create Microsoft Windows 7 Installer USB Mass Storage

To create a Windows 7 installer USB mass storage in Debian GNU/Linux, these tools are needed:

fdisk (util-linux)
mkfs.ntfs (ntfs-3g)
ms-sys (http://ms-sys.sourceforge.net/)

Steps for creating the installer:

Run fdisk on the device.
```
fdisk /dev/sdb
```

Create a new empty DOS partition table.

Command (m for help): o
Building a new DOS disklabel with disk identifier 0x7ebabd73.

Create a single primary partition.

Command (m for help): n
Command action
e   extended
p   primary partition (1-4)
p
Partition number (1-4, default 1): 1
First sector (2048-32767, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-32767, default 32767):
Using default value 32767

Set the partition bootable flag to active.

Command (m for help): a
Partition number (1-4): 1

Write the change to the storage device.

Command (m for help): w
The partition table has been altered!
Syncing disks.

Create a new NTFS volume in the new partition.
```
mkfs.ntfs -f /dev/sdb1
```
Mount the filesystem.
```
mount /dev/sdb1 /mnt/win7
```

Copy the content of Windows 7 installer.

rsync --progress --stats -rv /mnt/win7dvd/* /mnt/win7/

Unmount the filesystem.
```
umount /mnt/win7
```
Run ms-sys
```
ms-sys -7 /dev/sdb
```