4 Ways to Make a USB Bootable - wikiHow
To create a bootable USB flash drive, you'll need a bootable image. Image files usually end with .ISO, .IMG, or .DMG. If you already have an image file you want to turn into a bootable USB drive, you're good to go! Otherwise, see this wikiHow to learn how to create an image from an existing CD/DVD or files on your Mac.
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