Keep your finger held down on the “Option” button until you see a list of devices appear on-screen. Press and hold the “Option” button then press and release the power button to start your Mac. Power down your Intel Mac, then insert your USB drive if you haven’t already done so. If you see a “The disk you inserted was not readable by this computer” error, click “Ignore” and carry on. This could take a while depending on the size of the DMG and the speed of your Mac or USB drive. Wait for your Mac to write the contents of the DMG to your drive. You may also be asked to grant Terminal permission to access a removable volume, which you should grant. Type it, then hit Enter to begin the copy. You will be prompted for your administrator password. You’ll need to replace /path/to/image.dmg with the path to the DMG file created above, and /dev/diskX with the disk identifier used above (for example, disk3). You can do this with the following command: sudo dd if=/path/to/image.dmg of=/dev/diskX bs=1m diskutil unmountDisk /dev/diskXįinally, it’s time to write your DMG file to your USB drive. To do this, use the following command replacing diskX with the identifier (for example, disk3 in the screenshot above). Now that you know your identifier, you need to unmount that particular drive so that you can write your DMG file to it. The size of the disk (for example, 8GB) may give it away too. If you gave it a name like “LINUX” then you should be able to spot it under the “NAME” column.

You’re looking for the identifier for the USB drive you just formatted. Head back to Terminal and type the following to get a list of drives: diskutil list With your IMG file ready to go, it’s time to write to USB. Following on from the example above, you could type ~/Downloads/ubuntu. For ease, we’d recommend using the same location for both. Similarly, you’ll need to provide a destination in which the DMG will be placed (no need to add the “.dmg” extension). Replace /path/to/downloaded.iso with the location of your downloaded Linux ISO, for example if ubuntu.iso is in your Downloads folder, you can type ~/Downloads/ubuntu.iso.

How to make a bootable usb from iso mac