Hahaha thats right forgot about that can make bigger volumes but the vm's disk is still limited by file size of 2TB.
yeah adding the space within the guest OS independant of esx would be the best bet, didnt think this one thew when posting, appoligies.
Yeah you could add multiple disks to the vm and make them as dynamic disks within windows(guessing you would be running 2003 min) to make one volume.
few ways to tackle it