i've created a Windows 8 to go (Windows 8 that boots from a USB flash) on a Windows 8 machine and tested it on that machine and it worked fine. The system could boot from the USB.
Now I want to do the same on my MacBook Air rev. A (early 2008) with OS X 10.7.4 with the same Windows 8 to go. The thing is that when I restart OS X and hold the 'option' key, only the HDD which contains the OS X installation appears, no USB stick. Windows 8 To Go works for sure on a MacBook here is a link to a video demoing it
What am I doing wrong? Why doesn't my USB flash appear? I understood that there is something to do with MBR but don't understand exactly, not very familiar with the OS X ecosystem.