If you attempt to unmount the system disk accidentally, you get a failed to unmount error. Use the dd command as a parameter of the sudo command to write the ISO image to the flash drive:. Wait for the command to finish. The speed of the data transfer depends on the speed of your USB ports and the flash drive.
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After the prompt is displayed again, the data transfer is finished. You can then unplug the flash drive. The flash drive is now ready to be used as a boot device. I have been struggling with dd for years waiting for huge images to burn. There was another trick which involved two terminals and a screen command or something. I cannot recall.
This is so simple though! Thanks for that! However, the dd created bootable USBs worked just fine.
I used unebootin and found not all files loaded, does not work all the time, and created endless frustration and many hours. It seems for no issues dd is the only way to be certain of success. Would not load gnome through unebootin.
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Why You Need a Bootable USB Drive
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How to Burn ISO Image to USB Flash Drive on Windows 7/8/10
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macos - Copying ISO file to USB drive in OS X? - Ask Different
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