Thanks Elixer . I am running ssd just fancy something else. I read a review using a number of different USB sticks for main drive and on the speed side they were good (at least much faster than a disk based hard drive) . The pendrives they chose were the high price versions with I think faster chips and controller. What you said is I imagine true but I liked the thought of one machine being different to each pen owner. As opposed to dual boot for O/S and partitions and passwords. Its not for my main computer.