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Retrieving Actual Disk Size with VBScript

Posted on 2003-11-12
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Last Modified: 2012-06-27
I currently have a script written that retrieves the amount of space being used on a drive.  It shows the "Size" but not the "Size on Disk".  When you right click on a folder or drive and say properties it shows the "Size on Disk" which is the accuracy that I need for my script.  But I can't find how to retrieve this info using vbscript.  Does anybody know any links to sample code that does this.  Any suggestions appreciated.
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Question by:Sacrificial_Lamb
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Sacrificial_Lamb:

> It shows the "Size" but not the "Size on Disk".  When you right click on a
> folder or drive and say properties it shows the "Size on Disk" which is the
> accuracy that I need for my script.

The FileSystemObject doesn't support that property.  You could write your own COM object that uses the Win32 APIs to look it up, and then invoke that from VBScript.

You could also compute the value using the sector size of the disk, like this:
     SizeOnDisk = CInt((objFile.Size / SECTOR_SIZE) + 0.5)*SECTOR_SIZE

But that isn't going to be 100% accurate, and it won't help you if the file is compressed via NTFS compression.

Hope that helps,
Dex*
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