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I want to have a second installation of Mac OS X which I can tweak without affecting my existing installation. Is it possible to install a 2nd Mac OS X on another partition using Bootcamp, so I have two partitions each with Mac OS X installed?

Secondly, is this safe to do, or is it better to run it in a virtual machine? Thanks.

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There's no need to use Bootcamp to do this (Bootcamp allows you to run Windows etc. on your Mac); just partition your drive using Disk Utility and install a second copy of OS X. I've done this on my MacBook Pro without issue (I'm running 10.6 and 10.4). When you start up, hold option to choose which operating system you wish to boot into (or, to make it even easier so you don't have multiple copies of Macintosh HD, use rEFIt).

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Volumes can be renamed. Or do they still appear incorrectly as Macintosh HD when selecting volumes? –  Daniel Beck Dec 20 '10 at 18:27
    
@Daniel They still appear as Macintosh HD in EFI. –  squircle Dec 21 '10 at 4:36
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