I have a number of virtual hard drives that seem to be much bigger than they ought to be. In a quest for information on how I can shrink the size of my Virtual PC hard drives, I came across a great site providing more information than I initially sought. If you are looking to fine-tune your virtual disks, check out Robert Moir's Virtual PC FAQ's. For a list of what operating systems work with Virtual PC 2004, check out Jonathan Maltz's site.