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Thank you SimonGodot, <br />
I am going through the steps outline in the link, and will advise of results once completed.<br />

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I have a 70GB volume on which exists 26GB of data files &nbsp;and folders, so there should be freespace of 44GB. &nbsp;System is showing that only 400MB is availabe. &nbsp; &quot;Disk Inventory X&quot; reports the 44GB as space occupied by other files and folders - but does not show which files/folders. &nbsp;I should have 44GB free, but some phathom is using it up. &nbsp;Problem appeared after running MAC updates.
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I have a 70GB volume on which exists 26GB of data files  and folders, so there should be freespace of 44GB.  System is showing that only 400MB is availabe.   "Disk Inventory X" reports the 44GB as space occupied by other files and folders - but does not show which files/folders.  I should have 44GB free, but some phathom is using it up.  Problem appeared after running MAC updates.

Volume size 70GB, system shows that only 400mb Free

Mac OS X is the desktop operating system from Apple Inc., found on Macintosh computers. OS X consists of a Mach/BSD-based kernel, operating system interfaces primarily based on FreeBSD and additional frameworks (written in C, C++ and Objective-C providing user interface and application-level services.