Prepare Your Mac
Before installing Windows, you must make sure that your hard disk is properly configured and that the Mac has the necessary firmware, operating system, and software available. Follow these steps:
Back up your computer: Because you're about to run software that will alter the structure of your hard disk, you run a risk of losing data if an error occurs (or if, say, the power goes out halfway through the process). So, unless you're starting with a brand new Mac that has none of your own files and software on it, stop right now and do a full backup.
In this case, the best type of backup is a bootable duplicate, in which you copy the entire contents of your disk onto an external hard drive. For further guidance, see my book Take Control ...
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