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Message: <blockquote data-quote="Topper" data-source="post: 451608" data-attributes="member: 186250">I totally agree but to the non technically minded it is often easier to simplify the situation to make it easier for them to understand and it is a lot easier to draw, but then there's always someone wanting to complicate things<img src="http://www.satellites.co.uk/styles/default/xenforo/smilies/rolleyes.gif"  class="smilie" loading="lazy" alt=":rolleyes:" title="Roll Eyes    :rolleyes:" data-shortname=":rolleyes:" />It would be interesting though to know how the reality is achieved since to perform both functions simultaneously you would think the arm would be continuously hunting whilst alternating between read and write functions</blockquote>