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Message: <blockquote data-quote="pigoo3" data-source="post: 1750567" data-attributes="member: 56379">Great point that Harry brings up.  There was a time in "Apple History" when each computer model had a slightly different tailored version of the Mac OS installed on it (specific to that model).  And that tailored OS version would only run on that model (or a very small group of models).  The silver/grey disks that Harry is referring to is a perfect example of this.Official retail OS install disks that we had to pay $$$ for...installs a more "universal" OS install.  And this "universal" OS install was an install that (in most cases) could be run on almost all Apple computers capable of running that specific OS version.- Nick</blockquote>