UNetbootin allows you to create bootable Live USB drives for a variety of Linux distributions from Windows or Linux, without requiring you to burn a CD.You can either let it download one of the many distributions supported out-of-the-box for you, or supply your own Linux .iso file if you’ve already downloaded one or your preferred distribution isn’t on the list.(extracted from ：http://unetbootin.sourceforge.net/)
To create a bootable USB flash drive,first install UNetbootin by following steps.
1.Open up a terminal window and run following command:
sudo gedit /etc/apt/sources.list
Then,add following to the end of the file
deb http://cz.archive.ubuntu.com/ubuntu jaunty main universe
2.Execute following command in terminal:
sudo apt-get update
Open synaptic at System–>Administration–>Synaptic Package Manager,search “unetbootin” as keyword ,mark on the package and click on Apply to install
To create a bootable USB drive,open up UNetbootin at Applications–>System Tools–>UNetbootin.Do as following screen
Click on OK.It starts and you will get following screen when finish.Click on Reboot Now,if you want to test booting up with the USB drive on the computer.
If your USB partition is not marked as active.In your Windows,start->run->cmd and run following command
diskpart list disk select disk 1(the number 1 out from "list disk" ) select partition 1 active