Question about installing OS X 10.8 on USB drive
So my brother's MacBook Pro has OS X 10.6 running on it. I want to install Mountain Lion on it, but our internet is too slow to download it and install it OTA. I have a copy of the Mountain Lion installer.app downloaded on my Mac. Can I simply copy the installer.app to a USB thumb drive, copy it onto the other computer, and install it? Or is it necessary to first make a "bootable" install drive of the OS on the USB drive (say, with LionDiskMaker?). What's the difference anyway?
Thanks for any help