Create OSX 10.9.X bootable install USB

After a few versions of OSX its time to upgrade.

- Start by downloading the OSX install from Appstore.
- Go to Apps Made by Apple.
- Locate the OSX install. In my case OS X Mavericks Version 10.9.3
- Hit download and wait.  The download is visible in the updates tap or in your launchpad. (PS its ~6G)
- Once downloaded installer will ask to install automatically.
- Cancel the installation.

- Next install a 8G (min) USB flash drive and make sure its mounted.
- Go to command shell (Terminal >_)
- Execute the following to get root access
$ sudo bash
Password: ********

- Next execute the command to install OSX onto the USB key.  (in my case /Volume/UNTITLED)
# /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/UNTITLED --applicationpath /Applications/Install\ OS\ X\ Mavericks.app

- The installation will start.
Ready to start.
To continue we need to erase the disk at /Volumes/UNTITLED.
If you wish to continue type (Y) then press return: y

- After the USB is erased it will take ~45min (in my case) to build the USB.
Erasing Disk: 0%... 10%... 20%... 30%...100%...
Copying installer files to disk...
Copy complete.
Making disk bootable...
Copying boot files...
Copy complete.
Done.

- For more info go to:   http://support.apple.com/kb/HT5856