|It is a little difficult to understand your post due to the abbreviations and such, but I'd love to try to help.|
From what I can gather, if your physical hard drive memory size is fine before you log on to your work network, there should be no change when you connect to your work network. The only thing I can think of that may affect this would be if drive C: was rewritten in a logon script that may direct you to another physical location to store data (such as a shared network drive.) This may make your C: drive report differently than before.
In any event, if you're logging into a domain, then the domain administrator should be able to help with this sort of issue. You may want to pose this question to this person/department for further clarification.
I hope this helps!
If it's worth doing, it's worth doing right.