Virtual PC Differencing Disks - Pretty Useless
This post from Mitch got me going on Virtual PC Differencing Disks. While they seem like a good idea, I have found that the differencing disk grows to a size comparable to the size it would have been if you'de simply copied the VHD file and gone from there. The risk of rendering all your differenced disks unbootable and corrupt to save a couple of hundred meg of disk space just doesn't seem worth it. When Virtual PC becomes smart enough to allow minor changes to the base disk (like applying OS patches), I'll give them another go.