Make a startup disk mac

Enterprise administrators, please download from Apple, not a locally hosted software-update server. Use the 'createinstallmedia' command in Terminal Connect the USB flash drive or other volume you're using for the bootable installer.

Open Terminal, which is in the Utilities folder of your Applications folder. Type or paste one of the following commands in Terminal.

#3 Make a bootable drive for Mac

When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password. Terminal shows the progress as the bootable installer is created. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Mojave. This can occur due to hard drive enclosure interference, due to filesystem corruption on the backup volume, or due to the volume being improperly "blessed" blessing a volume stores certain information about the startup files in the volume's header, and your Mac uses that information to start the boot process.

This indicates that the kernel cannot load the kernel extension cache, or that it cannot mount the startup disk. This could be due to trying to run an incompatible operating system on your Mac, due to an extension conflict with the enclosure you are trying to boot from, or due to a firmware compatibility problem between the Mac and the enclosure. We see this quite frequently when trying to boot from a USB 3.

How to get MacOS installation files

We also see this more frequently on Yosemite when a critical kernel extension's code signature is invalid. If your Mac never progresses past the progress indicator below the Apple logo or stalls at the blue screen while booting from the backup volume, there is probably a problem with some of the system files that are called early in the startup process, or macOS is unable to load the correct drivers for your external enclosure at that stage of the startup process.

Again, try installing macOS directly onto the cloned volume while booted from the Apple Recovery volume to rule out a compatibility problem with the enclosure.

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This message generally appears when the volume you are trying to boot from is full or nearly full. Occasionally the Startup Disk Preference Pane will issue this error without any useful context. More often than not, the inability of the Startup Disk Preference Pane to change the startup disk is not actually an indication that the volume will not be bootable, rather it simply means that the Startup Disk Preference Pane cannot change the startup disk selection to that particular volume.


We have found a few conditions that will prevent you from making a startup disk selection:. If you boot from an older backup, e. If you boot from a High Sierra backup volume, you'll notice that your APFS-formatted, Mojave-containing Fusion volume is mounted read-only, and you will be unable to set that volume as the startup disk. The solution in both cases is to use the Startup Manager boot your Mac while holding down the Option key to select an alternate boot disk.

Once you have booted your Mac from the newer OS, you will be able to reset the startup disk selection.

How to choose a startup disk on your Mac to boot from USB – NinjaStik

If you add an APFS volume to your current startup disk's APFS container, the macOS bless facility will be unable to update the container's Preboot volume to include support files for the second partition. Multiple, bootable volumes within a single APFS container is a supported configuration, but you can only make the second volume bootable if you boot from some other startup disk for the duration of the cloning procedure. Likewise, you will be unable to change the startup disk selection to the second volume while booted from the first volume.

The solution is the same as above — use the Startup Manager boot your Mac while holding down the Option key to temporarily change the startup disk selection, then set the startup disk explicitly to the new startup volume.

Related Documentation

Alternatively, you can create a separate partition on your startup disk rather than adding a second volume to the same parent APFS container and make your backup to that separate partition. Temporarily change your startup disk with Startup Manager Startup Manager allows you to pick a volume to start from while the computer is starting up.

Immediately press and hold the Option key. After a few seconds, the Startup Manager appears. Use your mouse or trackpad, or left and right arrow keys to select the volume you want to use. Double-click or press the Return key to start up your Mac from the volume you selected.

Startup Manager automatically adds bootable volumes as you connect them. In Windows, click the Boot Camp icon in the system tray. From the menu that appears, choose Restart in OS X.