xpmode C drive keeps growing even though there is no data being added to it

Hello all,
I have tried to setup fixed hard drives in my xpmode but the drives keep growing even though there is nothing saved on them. The xpmode file should stay at 8 gb but I just saw it grow to 20gb and nothing new is added on the drive. Don't use email or internet on the xpmode side, do it on the Windows 7 side. I have to "compact now" to manage the drives. What am I doing wrong?
Thanks in advance,
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