Windows 2008 R2 / Exchange 2010 misreporting available space

All-
We have a Exchange 2010 DAG configuration with multiple mail stores  configured in an Active / Passive configuration on two mailbox servers.
The issue is, there’s a huge inconsistency with the space that’s been used on the server and the total of the amount of data.

Example, Total drive = 1TB
Data usage = 500GB
Available space on drive = 150GB
*There are no hidden or system files not been accounted for.
Has anybody seen this before?
paullordAsked:
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MegaNuk3Commented:
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Windows Server 2008

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