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Why a flash drive? A bootable external or internal hard drive works well for desktop Macs but presents a cumbersome problem for notebook Macs.
A flash drive is a simple, inexpensive, and portable emergency boot device that can handle OS X or the macOS. Heck, it can even have both operating systems installed, letting you use the emergency USB flash drive to boot any of the Mac's you may have. Even if you don’t use a notebook, you may want to have a bootable USB flash drive on hand. What You Will Need.
Yes, my Mac took a dive, a huge one. It won't even start up, so I found that the only possible way of fixing it on my own without taking it into the shop and spending hundreds of dollars I can't afford, was to try to re format the Mac's Hard Disk and install the latest version of OS X on it. I am crossing my.