You can do the same process in reverse if you need to copy the files back over, or restore the backup should your computer decide to break. Any settings you change or files you save there won’t be reflected on your primary installation. You can use your Mac as normal, but keep in mind that it’s separate from the installation on your main internal hard drive. This brings up the boot switcher and lets you boot from the external hard drive. Now format the drive as follows, substituting your disk name for diskN: diskutil eraseDisk MS-DOS 'WINDOWS10' MBR. Make sure you identify the correct USB disk, as entering the wrong device name in the next command could lead to data loss. Once booted up you go to Settings>Startup. The first step is to identify the USB drive device name using diskutil list.
Use your arrow keys to chose the external disk and press enter. Boot up the faulty mac while pressing down the alt button and a boot drive selection screen will be displayed. Connect the external disk to the faulty mac. This can take fairly long, depending on the speed of your external drive and its connection to your Mac, so it’s best to have a fast hard drive with Thunderbolt, USB-C, or USB 3.0 connections.Īnd that’s it! When Disk Utility is done, you can shut down your Mac and hold down Option when booting it back up. Turn off the mac that you used to do the installation. You can also choose an ISO image, but that doesn’t have much use here.Ĭlick “Restore,” and Disk Utility will start the copying process. Select your external drive in the sidebar, click “Restore” in the menu, and then select your main drive as the “Restore From” option.
#How to make a boot drive mac how to#
In the main window, you’ll see a pop-up menu under Select the volume to become the installer. 1 Start booting from USB device 1.1 1.2 Start booting from USB device1.3 2 How to Boot from USB on Mac, Windows.
It’s OK if it’s not formatted as a Mac drive. But, if you choose your external drive as the restore target, you can flip that action around and copy files from your main drive to the backup. Subsequently, how do I make a Mac hard drive bootable Connect your drive to your Mac.
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