How to Make a Bootable OS X Yosemite USB Install Key in 10 Steps

New OS X 10.10 Yosemite is officially available on Mac App Store for free as upgrade.
For clean install you will need bootable USB key or if you want to install  on multiple Macs, using a bootable install drive can be more convenient than downloading or copying the entire installer to each computer.
Here is quick and easy way to do it in 10 steps, all you need is USB key and OS X Yosemite.
 

Step One
Connect a 8GB or larger USB key to your computer then launch the Mac App Store from your dock.

Step Two
Navigate to the OS X Yosemite application page and click the Install button then click the Download button.

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