I am trying to install BackTrack on a USB drive. I used both Unetbootin and Pendrive Linux, both will work on my desktop and Backtrack will start. However, they will not work with my Lenovo Thinkpad x120e. I receive the "No operating system found" message. I even disabled the HD in the bios leaving only the USB options. Both USB ports are working fine and I know it is not the thumb drive as it works with my desktop. I am sure it is something to do with my Thinkpad, just not sure what. Any suggestions that I could try would be much help.