Want to make a Mountain Lion USB stick or SD Card Installer? Here’s how | 9to5Mac | Apple Intelligence: “Apple will not offer a USB or Optical Disk external installer to Mountain Lion (as far as we have heard). That does not mean you cannot sneaker net the install around your home, office or lab like Apple Store employees do (sometimes). Lion Diskmaker has been updated to allow you to make a bootable USB or SD Card installer on a 8GB piece of media.”