To install macOS or OS X from the USB flash drive, check how to clean install Mac OS from USB. Make A Bootable Installer for macOS via DiskMaker X or Install Disk Creator If you think it is too much trouble to use Terminal to make a bootable installer on a USB drive, you can use tools like DiskMaker X, Install Disk Creator. To install OS X Snow Leopard from the USB drive, you'll need to reformat the Mac's hard drive. To do this, look towards the top of the screen and click on Utilities from the top menu and then click Disk Utility from the drop-down menu.
A note about flash drives: You will need a USB flash drive to make this work. Your USB drive should be at least 8GB, and USB 3.0 is preferred. There are many, just make sure that it’s at least 8GB. Keep in mind that the following tutorial will purge everything on the drive, so make sure you back up any important data before proceeding. Step 1: Download macOS High Sierra from the Mac App Store.
Once High Sierra officially launches, you’ll be able to go directly to the Mac App Store and download it. Until then, you can access from Apple’s developer website, or via website. Step 2: Once macOS High Sierra is downloaded, close the installer that appears using Command (⌘)+Q. Video walkthrough for more macOS how-tos Step 3: Open Finder → Applications and right-click on Install macOS High Sierra Beta and select Show Package Contents.
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Step 4: Open Contents → Resources. Step 5: Open a macOS Terminal window via Applications → Utilities → Terminal.
Step 6: In the Terminal window type sudo followed by a space. Step 7: Drag createinstallmedia into the Terminal window from the Finder location opened in Step 4. Step 8: Type -volume followed by a space. Step 9: Connect your USB drive to your Mac. Step 10: Drag the USB flash drive volume into the Terminal window. Step 11: Type -applicationpath in the Terminal window followed by a space. Step 12: Open Finder → Applications and drag Install macOS High Sierra Beta into the Terminal window.
Step 13: Press Return on the Keyboard to submit the full command. Step 14: Type a ‘Y’ to continue when prompted to do so, and press Return on the keyboard. Step 15: The install process will commence by erasing the contents of your USB drive and copying the installer files to the drive. The entire process is quite lengthy — it can take around 20-30 minutes — so you’ll need to be patient as the install process completes. Once the process is finished, you’ll have a working macOS High Sierra bootable USB install disk that can be used to install macOS High Sierra beta on any Mac that supports it. In my opinion, if you’re looking to install a fresh copy of macOS High Sierra, this is the best way to go about doing so.
. After downloading the installer, connect the USB flash drive or other volume you're using for the bootable installer. Make sure that it has at least 12GB of available storage and is. Open Terminal, which is in the Utilities folder of your Applications folder. Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using.
After, follow these steps to use it. Connect the bootable installer to a compatible Mac. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to.
Learn about, including what to do. Choose your language, if prompted. A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions. For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal: Mojave: /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia High Sierra: /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia Sierra: /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia El Capitan: /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia.