Four Kinds of Installation
The Mac OS X installer can perform a number of different installations. For example, it can put a copy of Mac OS X 10.3 onto a hard drive that currently has:
Nothing on it. If you one day have to erase your hard drive completely—because it’s completely hosed, or, less drastically, because you’ve bought a new, empty external hard drive—this is how to do it. See “The Basic Installation,” below, for a step-by-step guide.
Mac OS 9 on the hard drive. Also see “The Basic Installation” below for a step-by-step explanation.
Mac OS X 10.0 through 10.2. The 10.3 installer can turn your older copy of Mac OS X into the 10.3 version, in the process maintaining all of your older preferences, fonts, documents, accounts, and so on. See “The Upgrade Installation” in Section A.4
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