Any settings you change or files you save there won’t be reflected on your primary installation. In order to boot your Mac from a disk in the CD / DVD drive, you’ll first want to insert disk into the drive, then you can either shut down the Mac, or reboot the Mac. Select the volume containing the bootable installer, then click Continue. Be sure the disc to boot from is actually bootable, most system restore and installation discs are. Turn on your Mac and continue to hold the power button until you see the startup options window, which will show your bootable volumes. You can use your Mac as normal, but keep in mind that it’s separate from the installation on your main internal hard drive. Plug the bootable installer into a Mac that is connected to the Internet and compatible with the version of macOS youre installing. I have tried suggests like hold down the option key during start up, and hold down command-R during start up. On computer start up, I get the 'No bootable device - insert boot disk and press any key' message.
#I mac bootable disk for mac
This brings up the boot switcher and lets you boot from the external hard drive. I had deleted my Bootcamp partition before I reset my startup disk to my the one for Mac OS. Select the volume containing the bootable. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your. 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. Apple silicon Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're.
#I mac bootable disk iso
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. Use the Terminal to make a bootable macOS Big Sur installer drive. Select your external drive in the sidebar, click “Restore” in the menu, and then select your main drive as the “Restore From” option. 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.
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