creating a USB install disk is super easy now.
1. Download the Mavericks installer
2. it should be located
/Applications/Install\ OS\ X\ Mavericks.app
3. Open up terminal and navigate into the Resources section of the app
/Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources
4. Run the following command:
sudo ./createinstallmedia --volume /Volumes/ToFormat --applicationpath /Applications/Install\ OS\ X\ Mavericks.app
* notice that we named our volume “ToFormat”, you must insert the name of the volume you want to reformat.
** there are some other instructions on the internet, which require you to search for the base system.dmg, but the issue with that method is that it does not automatically create a recovery hd partition, so that features like file vault are not available.