Resolved! Convert & tblDiskdrives
Why this works:Convert(Decimal(2,1),tblDiskdrives.Freespace / 1024 / 1024 / 1024)But this:Convert(Decimal(2,1),tblDiskdrives.Size / 1024 / 1024 / 1024)Causes Error: Expression evaluation caused an overflow. [ Name of function (if known) = ]