Rufus

Download Rufus (latest version):

   Rufus is a small utility that helps format and create bootable USB flash drives, such as USB keys/pendrives, memory sticks, etc. 
It can be be especially useful for cases where: 

• you need to create USB installation media from bootable ISOs (Windows, Linux, etc.)
• you need to work on a system that doesn´t have an OS installed
• you need to flash a BIOS or other firmware from DOS
• you want to run a low-level utility

Despite its small size, Rufus provides you with everything you need! 
Remember that once formatted, your drive is still usable as before to transfer data: it doesn´t have to be dedicated for DOS or ISO installation only.
Size: 939 KB
OS:  Windows XP/Vista/7/8/8.1 (32-Bit/64-Bit)