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A.2. Four Kinds of Installation

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A.2. 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 10.5 onto a hard drive that currently has: | A.2. 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 10.5 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 Erase Install on Section A.7 for a step-by-step guide. Mac OS 9. See The Basic Installation on the facing page for a step-by-step explanation. Your old Mac OS 9 System Folder will still be there after the installation but it won t do you much good. Classic doesn t exist anymore and the only Leopard-compatible Macs that can restart into Mac OS 9 are a handful of pre-2003 G4 models. Mac OS X 10.0 through 10.4. The Leopard installer can turn your older copy of Mac OS X into the 10.5 version in the process maintaining all of your older preferences fonts documents accounts and so on. See The Upgrade Installation on Section A.4. POWER USERS CLINIC The Partitioning Question Before you install Leopard you might want to confront the issue of partitioningyour Mac s hard drive dividing its surface so that it shows up on your desktop with two different icons and two different names. You can keep Mac OS 9 on one if you have a G5 pre-Intel machine and Mac OS X on the other. For that matter you can keep Leopard on one and Tiger on the other. Now you can live like a king enjoying all the advantages of people who have two separate hard drives. As a bonus the Mac even comes with a partitioning program Disk Utility. And it no longer requires first erasing the drive completely you can re-partition on the fly without disturbing whatever is already on the drive. For details see Section 10.30.11.1. On the other hand a substantial body of evidence specifically hundreds of moaning Mac fans online points to the wisdom of performing a clean install rather than an upgrade installation. Apple calls the clean .