To perform a clean install of Mavericks, you will need:
- A downloaded, but not installed, copy of OS X Mavericks. You can get this from the App Store, just don’t run the installer after it’s finished downloading to your “Applications” folder.
- An empty USB drive with storage capacity of 8Gb or more.
Creating the USB Installation Drive is a simple 10-step process:
- Plug the USB drive into your Mac.
- Open Disk Utility (you can search for this using Spotlight).
- Select the USB drive in Disk Utility’s sidebar, and open the “Erase” tab.
- Set the “Format” value to “Mac OS Extended (Journaled)” and name the drive “Untitled”.
- Click on the “Erase...” button, and wait for the operation to finish.
- Close Disk Utility and open Terminal (you can search for this using Spotlight).
- Copy and paste the command shown below into Terminal and press enter, then type your password and press enter when prompted.
- Step #7 might take up to half an hour to complete, don’t close Terminal or eject the USB drive while the command is still running - you’ll see a “Done” message on the last line when it's finished running.
- Restart your Mac and hold the Option (“⌥” or “Alt”) key on your keyboard until you see a boot menu.
- Select the USB Installer Drive, and the fresh installation of OS X Mavericks will begin.
The Terminal command to create a Mavericks Installer USB Drive:
sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Mavericks.app --nointeraction
To perform a clean install of Mavericks on additional Macs:
After the installation on the first machine has finished, simply plug the USB Installer Drive into the next machine and follow steps #9 and #10 above.