Everyone seems to think that an MBR drive can only utilize up to 2TB partitions. However I am using a 5TB WD external My Book drive right now with Windows XP and an ASUS P4P-800 MB and it see all capacity. I have only found that the same capacity in a GPT drive is what will not work. How is it that the manufacturer can make an MBR drive of higher than 2TB but a 8tb GPT drive cannot be converted by me to an MBR because of a restriction? How do the Manufacturers get past this restriction?