Creating a bootable USB to fix a crashed Mac.
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Open Terminal ( Applications > Utilities > Terminal ) and execute the following commands sequentially to create a blank disk image, mount it, write the installer data, and convert it to a .iso file. (Example below uses macOS High Sierra) Creating a bootable USB to fix a crashed Mac
This comprehensive guide covers the evolution of 64-bit Mac OS X, top safe download methods, and installation preparation. The Evolution of 64-Bit Mac OS X Intel/AMD CPU with virtualization enabled