- Aug 06, 2020 What makes this method great is that you don’t need a bootable High Sierra USB and you can simply use the installer from your startup drive and install the macOS on the extra drive. Moreover, this method won’t make you lose any data on your startup hard drive (except the volume or extra hard you will have to erase to install the macOS on).
- What makes this method great is that you don’t need a bootable High Sierra USB and you can simply use the installer from your startup drive and install the macOS on the extra drive. Moreover, this method won’t make you lose any data on your startup hard drive (except the volume or extra hard you will have to erase to install the macOS on).
*Quick note from Save Apple Dollars - Older OS X Images can now be downloaded directly from Apple at https://support.apple.com/en-us/HT211683 please right click on the image link and select “save as”.
Use Terminal to Create a Bootable macOS Sierra Installer. With a copy of the macOS Sierra installer downloaded from the Mac App Store and a USB flash drive in hand, you're ready to begin the process of creating a bootable macOS Sierra installer. Coyote Moon, Inc. This process completely erases the contents of the USB flash drive.
By Roman Loyola at www.macworld.com
Os Sierra Boot Usb
Senior Editor, Macworld JUL 3, 2017 1:32 PM PDT
Apple uses its App Store to distribute its software, like new Mac operating systems. It’s convenient, but sometimes it can take a while for a download to finish. And if you have multiple Macs, it’s inefficient to download the new OS to each and every Mac.
That’s why I like to make a bootable external drive for the sole purpose of installing the Mac operating system. When I need to tend to a bunch of Macs, it’s much faster to use a bootable drive instead of going to each Mac, launching the App Store, searching for the operating system, downloading it (after entering my Apple ID), and then running the installer.
You can create a bootable USB flash drive with the macOS Sierra installer that’s now available. The installer software will take up nearly 5GB of storage space. Here’s how to create a bootable macOS Sierra installer drive.
Macworld also has bootable-install-drive instructions for:
Lion (OS X 10.7)
Download the macOS Sierra installer
Launch the App Store app, then look for macOS Sierra in the store. (Here’s a link.) Click on the Download button, and your Mac will download the installer to your Applications folder. If it automatically launches after download, quit the installer.
Keep the installer in the Applications folder.
If you’ve already upgraded your Mac to Sierra, the installer is removed from the Applications folder. You can download it again if you go to Purchased in the App Store. Look for macOS Sierra in the list of apps that you’ve bought, and click on the Download button. If it automatically launches after download, quit the installer.
Get an external drive
You can use a USB flash drive or a hard drive with room for the installer software. I’ve used different drives with success, including a VisionTek 120GB USB 3.0 Pocket Solid State Drive ($83 on Amazon) and an old 8GB Iomega Micro Mini Hard Drive.
Bootable Usb Software
Don’t worry if the drive isn’t formatted for the Mac. The drive will be reformatted automatically as part of the process. Change the name of your drive to Untitled; you need to do this for the steps below.
The quick and easy way
The process detailed below involves the Terminal. If your really don’t want to use Terminal, there are a couple of free apps you can use.
Install Disk Creator is a straightforward way to create a boot disk. I was able to make a macOS Sierra external USB boot disk in a few minutes, and the installation worked without a hitch. Also works with older versions of OS X.
Diskmaker X is a popular app. It also supports older versions of OS X.
Use the Terminal to create a boot disk
So you have your external drive, and the Sierra beta installer is in place. Now you’re going to use Terminal to create a boot drive. If you’ve never used Terminal before, don’t worry. This is pretty easy.
Here are the steps to create a macOS Sierra beta boot disk. (Apple also has these instructions.)
Connect the external drive to your Mac. (In the Terminal command you will use, I use
Untitledto represent your external drive. If your drive is named something else, you need to change
Untitledto the name of your drive.)
Launch Terminal (/Applications/Utilities/Terminal.app).
Copy the following:
sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install macOS Sierra.app
Go back to Terminal and paste the copied code at the prompt.
Terminal will ask for a password. This is your user password. Terminal doesn’t display characters when you type it in. Hit Return.
Terminal will tell you that it will erase your drive. To confirm that you want to continue, type Y and hit Return.
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.
Terminal will copy the installer file to your drive. This will take a few minutes.
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.
How to boot from the installer drive
Plug your external drive into your Mac.
Power up (or restart) your Mac. Press down on the Option key while the Mac boots.
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 hit Return. (You don’t need to select a network to proceed.)
Your Mac will display an OS X Utilites window. If you want to install 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.
Full Credit for this article is given to Roman Loyola and www.macworld.com please visit their website for more helpful information about fixing Macs.
If a new version of macOS becomes available, there are a lot of people who are considering a clean installation, a so-called clean install. This can come in handy when you restore the Mac factory settings. You make a fresh start on your Mac, without taking all the previous problems and it also comes in handy if you have taken over a Mac from someone else and want to start with a clean Mac. In this case we use High Sierra.
Note: make sure that you always have a backup of all your files and data should something go wrong! You can do this, for example, via a Time Machine or another external hard drive.
Clean Mac installation
High Sierra is the latest version of macOS (at time of writing). If you want to install this or all of the following updates, you can simply do so from the Mac App Store. In addition, all user data is retained. The big advantage is that you do not have to worry about it: you just have to press a button and have some patience. But you also include all the junk from previous installations. If you want to start over with a clean Mac, you have to reset the Mac factory settings and perform a clean installation. In doing so, the complete content of your disks is deleted.
macOS clean installation from a USB stick
Before you get started, you will first need to install a version of macOS on a separate USB stick. You need a USB stick with at least 16GB of storage.
Download macOS High Sierra (or another version) from the Mac App Store. Apple itself maintains a list of older software, which you can find via the official Apple Support download page. This is system software for your older Mac, but you will also find security updates and older versions of QuickTime, Safari, iMovie, Pages, Keynote and the like. Click Load more results repeatedly to see older software.Click here to go to the Official download page at Apple Support.
After the download is complete, you must disable the installation screen that appears, to prevent the installation from starting. Insert the USB stick into your Mac and give it a logical name, for example ‘macinstallation’. It is important that no special characters are allowed in it. Start the program Terminal via Programs – Utilities – Terminal or search for it in Launchpad. Enter the command below in Terminal.
Note that the word behind Volumes must be exactly the same as the name of the USB stick. The path can also be different if you want to install a different version of macOS.
Perform clean installation
Installing a clean installation of macOS is the next step in the process. Carefully follow the steps below, so nothing can go wrong. Insert the USB stick with the installer in your Mac and restart it with the Alt / Optn key pressed. The macOS Startup Manager will pop up with all bootable drives and devices that are connected. Select the USB stick that you had prepared for the installation and press Enter. The Mac will now boot from the installer on the USB stick. This can take a few minutes, depending on the speed of the USB port and the USB stick. Once this is done, the Mac will return to the macOS Utility startup window. You get a number of options there, such as Restoring a Time Machine backup. Choose Disk Utility. In the following steps your startup disk will be completely erased, so you can start with a clean slate. Select the desired startup disk. This is usually Macintosh HD.
Then click Clear to delete the entire disk. Also make sure that the format is set to macOS Advanced (Journaled). The Disk Utility now deletes the entire disk. Once this is done, you can close this program. After this you will return to macOS Utility. Now select Install macOS and the installation of High Sierra will now take place. During the installation process, choose the correct drive you just deleted, such as Macintosh HD.
After these last steps you will be guided through the standard macOS installation procedure. Once everything has gone well, you have a completely clean Mac with the latest version of macOS. Of course you do not lose everything. When you log in with your Apple ID, all personal details such as calendars and e-mails are synchronized with iCloud.