i have a san disk pen drive of 16 gb.....i wanted to transfer some material from my friends laptop.he has apple mac pro and i use windows.....when i connected the disk to his laptop it showed two drives one of 200mb and the other of 15 gb...but when i connected the same to my laptop which uses windows it showed up with just one drive of 200mb.......can anyone help please

That stands to reason. His Mac and your Windows don't have the same type of file system!