You've reached the limit of Integer math - you need to convert to Real numbers..

 Code:
$Result = 1.0 * GetDiskSpace('C:')
$Result = $Result * 1024.0
will insure that you convert the GetDiskSpace result to a Real number, and keeping the ".0" is just a precaution added to the "1024".

As long as you start your formula with a Real value (decimal point), Kix will treat the entire expression as a Real value.

Glenn
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Actually I am a Rocket Scientist! \:D