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Exchange 2010 - disk space getting used up despite available whitespace

JAM asked
Last Modified: 2015-07-27
We’re running low on available disk space, so I cleaned up our mailbox databases and made available up a bunch of whitespace.
That whitespace is being used up in an expected fashion, however, I am noticing that some disk space is also/still getting used up.  For example, here is one of our databases over 3 dates:

Date              DB size         Whitespace      Free disk space
July 14    --    955.7GB    --    31.19GB    --   8.75GB
July 22    --    955.7GB    --    29.13GB    --   8.41GB
July 23    --    955.7GB    --    27.44GB    --   8.35GB    

Is this normal and part of an overhead of disk space that gets used, despite having available whitespace?  
And if so, is a daily 4-6% overhead/decrease to be expected?

Note.  The drive in question is holding only that database, nothing else (logs on a different drive, OS on a different drive, etc).
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