use the 30 gb as your windows xp OS drive. Delete everything on it,when you reinstall windows on it after you have have back up your data, music and pictures. use the 200 gig as your documents drive. this thread will tell you how to do that
http://www.techist.com/showthread.php?s=&threadid=56137
http://www.techist.com/showthread.php?s=&threadid=56137