First of all disinformation can be explained as something that has to do with fears: it frightens us by taking away our individuality, as disinformation is not done for one single person. It is a manipulation; a manipulation the influenced persons did not ask for.
Disinformation is never the launching of one single information/message. Several - and in most cases many - different pieces make up a puzzle of deception. One single message can be called true or false, but only the combination of several and more informations makes up a system that has the power to influence opinions.
The purpose is what produces the disinformation, whereas a wrong information (even as a number of wrong informations) happening by accident represents simply a false information.
The person or group presenting a disinformation knows very well what he/it is doing. The aim is that the person who receives the disinformation gets influenced into a certain and well-planned direction. Therefore the wrong information has to reach the unconscious part of the mind, has to be integrated into personal thoughts.
A good way to reach that goal is to use a commonly known information, something familiar to reach the confidence of the recipient. The best is to use a quasi neutral message. Afterwards the real disinformation is woven into that other information. The mixture between truth, half-truth and lie is the most adequate method to get a disinformation into people's minds.
The knowledge about how to use material and how to slightly change it until the statement turns against someone or some idea, is a type of art to cope with words.
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Munitions of the Mind. A history of propaganda from the ancient world to the present era. Manchester 1995 (2nd ed.)
This book gives a quite detailed insight on the tools and tasks of propaganda in European and /or Western history. Starting with ancient times the author goes up till the Gulf War and the meaning of propaganda today. In all those different eras propaganda was transporting similar messages, even when technical possibilities had not been fairly as widespread as today. Taylor's book is leading the reader through those different periods, trying to show the typical elements of each one.