Which Method of Making USB Mavericks Installer?
I use Mavericks OS X 10.9.1. Which of the following methods should I use to make a USB Mavericks Installer/Re-Installer?:
1. How to Create an OS X Mavericks USB Installation Drive: lifehacker.com/how-to-create-an-os-x-mavericks-usb-installation-drive-145028002 6
(this method performs a "clean install") do I need to perform a clean install?
2. How to make a bootable install of Mavericks on Flash USB Drive? - MacRumors Forums: forums.macrumors.com/showthread.php?t=1649986
(does this method performs a "clean install?") do I need a clean install?
3. The MacRumors Forums talks about "a copy of OS X Mavericks GM." What is a "OS X Mavericks GM?" What does GM mean?