I've downloaded the trial version for Parallels and made a Windows XP image on my mac. Ive nosed around, installed a few items on the Windows.hdd image. However, I notice that the volume reports it is full with about 5,5GB of data. Yet when i calculate each file individually, I never reach such a high amount. There should be just around 2,5-3GB data on the volume. Why does parallels insist that I have 5,5-6GB?