You don ’ t need to use Install Disk Creator or Diskmaker X to create a bootable installer. You can do it in the Terminal. Never used the Terminal before? No problem — it ’ s easy. Here are the instructions.
Connect the external drive to your Mac. ( In these instructions, I use Untitled as the name of the external drive. If your drive is named something else, you need to change Untitled to the name of your drive. )
After a few moments, your Mac should display the Startup Manager, which will show you the available boot drives. Click on the external drive and press Return. ( You don ’ t need to select a network to proceed. )
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The macOS HIgh Sierra Beta in the App Store.
Terminal will tell you that it will erase your drive. To confirm that you want to continue, type Y and press Return.
For a single Mac, this process works well, but if you have several Macs, it ’ s not efficient. That ’ s why I like to create a bootable installation drive. I can use the drive on each Mac I need to upgrade, saving me from the process of entering an Apple ID and password and then waiting for the download.
The main window of Install Disk Creator.
You ’ ll see that Terminal erases your drive. When that part is done, your Mac may ask you if you want to use the drive for Time Machine. Click Don ’ t Use.
When creating the boot drive, the storage device is reformatted, so there ’ s no need to format the drive beforehand.
It ’ s easy to create an external installation drive. It ’ s also handy to keep around, just in case you ’ re in a situation where you rather use the drive than rely on booting in Recovery mode.
Just about any type of USB external drive will work: thumb drive, hard drive, or SSD. The installer software will take up about 6GB, so your drive needs to have at least 6GB available.
Plug your external drive into your Mac.
If you have a 2015 or newer MacBook or a 2016 or newer MacBook Pro, you may need Apple ’ s USB to USB-C adapter. This will allow you to connect a storage device that uses a USB type-A connector. If you have a USB-C storage device, then you don ’ t need to get the adapter.
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Quit the installer after it launches automatically. You can find the installer app in your Applications folder.
Type Y and then press Return to confirm.
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Before you can proceed, you need to confirm that you want to erase the disk.
Under the pop-up menu, you ’ ll see "Choose a macOS installer." If you have only the High Sierra installer on your Mac, Install Disk Creator will automatically select it. If you have other macOS installers, you need to click on "Choose a macOS installer" and select the High Sierra installer.
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Select and copy the following:
When macOS High Sierra gets released later this fall, Apple will distribute it through the App Store. You need an internet connection, and the download will be about 6GB, so it ’ ll take a few minutes.
To connect a USB device with a type-A connector to a MacBook or MacBook Pro with USB-C, you need the USB to USB-C adatper.
Here are a couple of different ways you can create a bootable macOS High Sierra installation drive. First, let ’ s cover the items you ’ ll need and how to get them. Then we ’ ll go over the two ways to make the drive itself.
Your Mac will display a macOS Utilites window. If you want to install High Sierra and leave the data intact, select Install OS X. If you want to start over and wipe out the data, you need to go into Disk Utility to reformat the internal drive first, and then install macOS Sierra.
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Macworld also has bootable-install-drive instructions for:Get an external drive and maybe an adapter
If you already installed High Sierra, you won ’ t find the installer app in your Applications folder. You also won ’ t find it in the App Store app under Purchased. Click here to go to the macOS High Sierra Beta section of the App Store. This link should open the App Store app and take you directly to High Sierra. Under the High Sierra icon on the left of the banner, click on the Download button. This will download the installer to your Applications folder. If the installer auto launches, press Command-Q on your keyboard to quit the app.
When you ’ re ready, click "Create installer." You will need to confirm that you want to erase the disk. IDG
When the App is done, your installer is ready to use.
Terminal will copy the installer file to your drive. This will take a few minutes.
What to do when ‘ this copy of the install OS X application cannot be verified ’ or ‘ the installer payload failed signature check ’
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Since High Sierra is in beta, you have to sign up for the public beta program. Here are instructions for joining the Apple Beta Software Program.
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Power up ( or restart ) your Mac. Press down on the Option key while the Mac boots.
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After copying, Terminal is done. You should see Terminal display a "Copy complete" and Done notice. You can quit Terminal and your drive is ready for use.
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