bootable, as in you can run os x from it or install from it?
I'm sorry. You used to be able to boot up from your osx install disk and run disk utility, from my Quadra 700 to my mac mini running 10.4. They must have removed that option. If you don't have an answer or can't comprehend the question then leave it alone.
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I have a new IMac on the way and want to make a boot-able partition on a external drive. What is minimum size partition I would need ?