I just got Parallels up and running and using Windows XP Pro on a MacBook. It added a default of only 8 gbs of harddrive I used the Image Tool and Put it to 20 gbs. it did the little "installing" thing to change it. I opened Windows Shut it down and saved me setting and restarted my actually computer. i opened Parallels and Opened up the virtual system. On the properties tab on parallels it showed 20 gbs, but the hard drive still only shows 8 gb and it wont let me go over it.
Hello! Please follow the steps described in this article: How to resize the virtual hard disk. Best regards, John