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You should now be able to boot with the USB installer while holding down the Option key and begin your clean install of OS X Mavericks.

It shouldn't take more than 20 minutes or so for it to complete. Since the utility requires root privileges, you'll need to enter your password to continue. Step 3: Open a terminal window and enter the following command: sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ OS\ X\ Mavericks.app -nointeraction You can also name the USB flash drive to something other than "Untitled," but just make sure to change the command in Step 3 to reflect the correct name. If you do, unmount the other volume or rename it temporarily. Step 2: Format a USB flash drive that's at least 8GB, as Mac OS Extended (Journaled) and keep the default name as "Untitled." Make sure that you don't have another volume with the same name. Make sure the installer is located in the Applications folder. If you've already upgraded, you'll have to download the installer again from the App Store, since it deletes itself after the upgrade. Step 1: Download the OS X Mavericks installer from the App Store, but don't run the installer yet. Here's how to create a bootable OS X Mavericks install drive:

With a USB installer, you'll be able to perform a clean installation of Mavericks whenever you want and without having to download it again from the App Store. However, there's a new Apple utility with Mavericks that makes it relatively simple, and thanks to MacForums member, tywebb13, we know how to use it.