I made a bootable portal HDD(40gb) with Universal USB installer..
Worked perfectly than I made 2 partitions. One with bt other as an empty volume(for backing other stuff)
I did this on my desktop and I can boot bt on it with ease on it.
But when I plug the the extrnal HDD to my netbook( levano thinkpad xe100) and turn it bt doesn't boot and windows boots instead .