How do I create a OS X Mavericks USB installer?

Your 8 GB USB drive or larger should be called Untitled and formatted as Mac OS Extended (Journaled). The installer should be called Install OS X Mavericks.app (can be downloaded from the app store) and should be in your Applications folder.

Run this in terminal and wait about 20 minutes:

sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Mavericks.app --nointeraction

You should see something like this:

Erasing Disk: 0%... 10%... 20%... 100%...
Copying installer files to disk...
Copy complete.
Making disk bootable...
Copying boot files...
Copy complete.
Done.

You can then boot up from the USB by holding down the option key, then install the GM from the USB.

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