Boot on USB from a previous version of OSX I own a mid-2013 Macbook Air running Mavericks and wish to boot on a USB stick containing a bootable version of DiskWarrior. The problem is DiskWarrior wasn't updated for quite some time and, though the application version works just fine in Mavericks, the bootable version is old and is based on OSX 10.6.7. 

My usb disk is detected correctly as a startup disk inside Mavericks, and I can even see it as an option when I press ALT during startup. The problem is selecting this disk just show the Apple logo and the actual boot from the usb never takes place. I recall reading someday about how OSX would prevent you from booting from older version of the system. Is this what's happening here? Is there anyway around this? Do I absolutely have to find an older mac that would allow me to boot from OSX 10.6.7?
You can't boot a version of OS X older than the version of OS X that shipped with the machine. This is because older versions of OS X do not contain the drivers required to support the newer hardware that it had no knowledge of at the time of development. The boot sequence will freeze on the Apple logo or blue screen and you will not be able to boot.