Here's a full tutorial on how to create a macOS 10.13 High Sierra Beta bootable USB drive for installation on your Mac.
Create a macOS 10.13 High Sierra Beta Bootable USB Drive for Clean Installation
If you are looking to install macOS 10.13 High Sierra Beta on your Mac from scratch, then you need a bootable USB installation drive for that. In today's guide, we're going to walk you through the entire process in a step by step manner. But before you even begin, it's important to know that you should have access to the macOS 10.13 High Sierra Beta image file. This is something that is not possible without an Apple Developer Program membership at this point. Also, make sure you read the guide till the very end before going ahead with the process.
Download macOS 10.13 High Sierra Beta Image File
Sign in to your Apple Developer Program account then click on the Downloads button on the left hand side pane. Once here, click on the blue Download button on the right hand side of the macOS 10.13 entry.
This will download Apple's update utility, allowing beta updates to be installed on your Mac. Just follow the on-screen procedure and you'll be taken to the Mac App Store page for macOS 10.13 High Sierra Beta. Click on Download and the image file will begin downloading. It's a pretty big download at over 5GB, so relax while the download is happening.
Once the image is done downloading, move on to the next step.
Erase / Format Your USB Drive with Disk Utility
Make sure you have a 16GB USB drive with you that's capable of pulling off USB 3.0 or above speeds. Faster the better.
1. Plug your USB drive into your Mac.
2. Launch the Disk Utility app either from Launchpad, or do a quick search using Spotlight.
3. Select your connected USB drive from the left hand side pane. Make sure you get this right. You do not want to end up erasing something else.
4. Now click not the Erase button at the top.
5. Without changing any default setting at all, click on the Erase button to wipe your USB drive clean. Refer to the screenshot below to see what I'm talking about.
Create macOS 10.13 High Sierra Beta Bootable USB Drive
1. With your USB drive plugged into your Mac, launch Terminal from Launchpad or Spotlight search.
2. Type in the following command as is. And please note one thing: there are double dashes in there too. Refer to the screenshot right below the command to see what exactly you should be typing. If there's a single typo in this command, the process will fail there and then.
sudo /Applications/Install\ macOS\ 10.13\ Beta.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ 10.13\ Beta.app
3. Hit the Return key on your keyboard once done. You will be required to enter your administrator password, so do so when prompted. Follow on-screen instructions carefully.
Let Terminal do its thing, and you'll be prompted when everything is complete. The entire process shouldn't take more than 15 minutes at best.
Once done, you'll be left with a macOS 10.13 High Sierra Beta Bootable USB drive. The next logical thing to do is: clean install macOS 10.13 High Sierra Beta onto your Mac. Will will be covering that in a separate guide, so stay tuned for that.
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