I made my pen drive to botable Mac OS X (Niresh Version). Everything was fine but when i wanted to format my pendrive for normal use. After that I found a horrible  problem my 16gb pendrive supports only 196 mb ! So you will face this problem when you will make a botable Mac OS X speacially Niresh version. Try this method before buy a new one.         Follow the steps------   1 - Type disk part