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I’m upgrading my MacBook to OS X 10.10 Yosemite tonight, but before I do so, I’m burning it to a bootable USB installer drive. Why? For me, the main reason is that a bootable installer drive makes a handy emergency disk in the event my Mac experiences problems.
It’s not difficult to create a bootable installer drive from the Yosemite installer. Lifehacker did a nice write up on how to do it: How to Burn OS X Yosemite to a USB Flash Drive
A word of warning — if you have a Mavericks installation USB, the instructions above will erase it prior to burning Yosemite.
Additional resources for the upgrade:
See you on the other side!