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Mac OSx and Other Apple related topic here
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Apple distributes macOS High Sierra through the App Store. You need an internet connection, and the download will be over 5GB, so it’ll take a few minutes.
For a single Mac, the installation process through the App Store 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.
Get the macOS High Sierra installer software
Once the download is complete, the installer will launch automatically. But don’t continue with the installation. Instead, press Command-Q on your keyboard to quit the installer.
How to format your usb flash drive for macOS High Sierra
You'll need to start with a clean thumb drive or hard drive in order to make it a bootable drive.
1. Plug the thumb drive or cable for your hard drive into the appropriate port on your Mac.
2.Click on (Finder)in your Dock to open a Finder window
3.Select (Applications)from the list on the left side of the window
4.Scroll down and double-click on (Utilities)
5.Scroll down and double-click on (Disk Utility)
6.Select your drive under( External.)
7.Click on the (Erase)tab at the top of the window.
8.Note the name of your external hard drive (probably "Untitled") because you will need it when you create a bootable drive. If you have more than one external drive with the same name, you will need to rename the drive you are using as a bootable installer now.
9.Select (Mac OS Extended (Journaled) from the format list.
11.Click (Done)when the process is complete
12.Close the (Disk Utility)window.
Your thumb drive or external hard drive is now ready.
How to make your external drive into a macOS High Sierra boot drive
Important:You will need to use an administrator account on your Mac in order to run the Terminal commands to create a boot drive.
1.Click on (Finder)in your Dock to open a Finder window
2.Select (Applications)from the list on the left side of the window
3.Scroll down and double-click on (Utilities.)
4.Scroll down and double click on (Terminal.)
5.Recall the name of your formatted external drivewhen entering the following text into Terminal. If it is not named "Untitled," you will need to change the command syntax for the pathname where it says: (Volumes/Untitled.)The name of the drive can't have any spaces and it is case sensitive.
6.Enter the following text into Terminal (Don't forget to change the name "Untitled" if your hard drive is named something else):
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled
7.Hit the (enter/return key.)
8.Enter your administrator account password. This is the password you use to make changes on your Mac or log in. No text will appear in Terminal when you enter the password.
The process could take a very long time, depending on the drive. When it is done, the Terminal window will report "Done."
How to use macOS High Sierra with a bootable drive
Once macOS High Sierra is installed on your external drive, you can boot up any Mac with the drive plugged into it.
1Turn off the Mac you want to install macOS High Sierra with the bootable drive.
2.Connect the drive to your Mac via the USB port.
3.Turn on your Mac.
4.Hold down the(Option)key when it starts up.
5..Select the (external drive)with macOS High Sierra on it from the list of systems to start up your computer.
Follow the installation process when prompted.
Do you have any questions about how to create a bootable drive for the macOS High Sierra installer? Let us know in the comments.