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I never heard the auto part... Sent from Lou Judson's 🍎ipad Mobile 415-271-8070 On Sep 9, 2014, at 8:24 AM, Clark Johnsen <[log in to unmask]> wrote: > The arithmetic of CDs had several variables: the byte length, the total > time desired, and (omitted so far here) the need that was seen for it to > fit into the standard automobile dashboard space along with the unit > enclosing it. 4 3/4 inches was determined to be that size. They could pick > and choose among the rest.