I have an external hard drive that will be used for backup. I am not used to the vista management and have a question. In the little box on the left it says Disk 5 Basic Online. If I right click on it it brings up the box that says convert to dynamic disk and below that convert to GPT disk or MBR disk. On the other box to the right (the long one) if I right click it says New Simple Volume. Anyone care to tell me which to choose? Thanks.