Make a PenDrive bootable, using CMD prompt.

Today, I will tell you the best way to make a pen-drive boot-able for Windows-Installation purpose. Just Follow these steps :

1.  Open CMD.
2. Type diskpart and press  Enter.Now a new command prompt will open.(In windows 7)
3. now type list disk and press Enter. It will show all the storage units connected to your computer.
4. now type select disk # and press Enter where # is the number of your Pen Drive.(Eg : select disk 2)
5. now type clean and press Enter, it will clean your Pen Drive for errors.
6. After successfully cleaning type create partition primary and press Enter to create partition of your Pen Drive.
7. After successfully partitioning type select partition 1 and press Enter. It will show that partition 1 is now selected partition. 
8. Now type active and press Enter to make selected partition active.
9. Then type format fs=fat32 and press Enter to format the Pen Drive in fat32 format.It takes a few minutes to complete the formatting.
10. After 100% formatting, type assign to assign a drive letter to the formatted flash disk or PD.
11. Then type exit and press Enter to exit from current CMD prompt.
12. Again type exit and press Enter to exit from previously opened CMD promt.

and Now you have done...Your flash drive is 100 % boot-able. 

Now mount your windows CD or image file on any virtual drive application like Power ISO and after mounting run the following command in CMD.

• xcopy J:*.*/s/e/f N: and press Enter, it will start copying Windows files to flash drive in bootable format.

Here J=letter for mounted drive (Source drive.)
           N=your flash drive (destination drive, Pen Drive)

A step by step video Tutorial is shown below:-

That's all done.