Create Bootable USB Pen Drive for Windows 8

Tools Required:

1. USB flash drive with a minimum capacity of 4 GB.
2. Windows 7/8 Setup DVD or iso file.


Step 1 : Plug-in your USB flash drive.

Step 2 : Open the PowerShell (OR Command Prompt if PowerShell Not Exist). If you are using Windows 7/Vista then open it with administrator rights.

"Go to Start -> All Programs -> Accessories ->Windows PowerShell ->  Right-click on “Windows PowerShell” and select “Run as Administrator”.

Step 3: In the PowerShell/Command Prompt, type these commands in exact order one by one.

diskpart
list disk
select disk x (here "x" is the number corresponding to the USB disk, which you need to replace with what is shown in your system)
clean
create partition primary
active
format fs=fat32 quick
assign
exit

Be very careful when using the "select" command — you don't want to end up formatting your hard disk instead!

Step 4: Mount The Windows 8 ISO Image Into A Virtual Drive
Burning the ISO image onto a blank DVD is not an option if you don't have an optical drive. You can instead mount
 the file as a virtual drive. Windows 8 comes with an inbuilt utility; all you need to do is to double-click on 
the image file and it will get mounted as a virtual drive. However, if you have an older version of Windows, you can use a freeware virtual drive application such as MagicDisc to mount the image.

Step 5: Make The USB Drive Bootable
Assuming that F: is your virtual drive letter where the Windows 8 ISO image is inserted and G: is the location of your USB drive, open the command prompt as mentioned earlier and type the following commands:

F:
cd boot
bootsect.exe /nt60 g:

Again, double-check the target location for the boot record to ensure you don't accidentally overwrite your HDD's bootsector.

Step 6: Copy The Installer Files
Don't close the command prompt yet. The USB drive has now been made bootable, but there's one more command you need to execute in order to transfer the Windows 8 installation from the virtual drive to the USB stick. In the same command prompt window, type the following command:

xcopy f:\*.* g: /e /f /h

You can alternatively copy all the files in the virtual drive to the USB drive by using Windows Explorer, but using XCOPY ensures that system and hidden files are also copied.


Step 7: Boot Off The USB Drive
To install Windows 8 on your netbook or computer, you must set it to boot through the USB flash drive. To achieve this, shut down your computer, then go into the BIOS (CMOS setup) by pressing <DEL> or <F2> as soon as you power it on, without unplugging the USB stick. Set the USB drive as the primary boot device, save the settings, and restart. Alternatively, since most modern computers (ie, post 2005) allow you to select the boot device via a hotkey after it is powered on (either through <ESC>, <F9>, or <F11>), you can choose to boot through the USB flash drive this way.
 Install Windows as usual. If you've changed the boot sequence through the BIOS, remember to reset it to the internal hard drive when the system restarts after copying the installer files. Let us know in the comments section if you face any issues.