Global Nav Open Menu Global Nav Close Menu; Apple; Shopping Bag +. In this article we'll run through the steps necessary to create a bootable installer of the Mac operating system, whether it's so you can install the latest version of the macOS on multiple Macs. Medcalc download free for mac.
macOS Sierra is a fantastic update arriving from Apple to make us love our Macs even more. It has plenty of new features, and also has the same easy clean install and upgrade flow as did the previous OS.
LEARN MORE: How to Clean Install the macOS High Sierra?
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Note, that getting an upgrade is the easiest way of installing the new macOS. It saves all your personal files, apps and user data, while a so-called clean install of Sierra will erase all data on the startup drive and replace it with a clean copy of OS. But, if you like an idea of giving your Mac a fresh start with a new macOS and nothing else, a clean install is the right option for you.
Also, in case you’ve noticed that with time your Mac is running slower, it has unusual startup or shutdown issues and crashes, a clean install may be a good way to get back the speed and fix the problem.
First of all, make sure that your Mac is able to run MacOS Sierra.
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Clean Install macOS Sierra on Your Mac’s Startup Drive
If you're going to perform a clean install on the startup drive, you need to backup your data, create a bootable copy of the installer, and, finally, boot from the bootable installer. So, let us begin.
Step 1: Clean up your Mac
To make sure Sierra has no troubles installing and works fine after, you need to get rid of system junk on your Mac first. You could clean it up manually, but using a cleaning app like CleanMyMac X will save you hours on that. Junk removal with CleanMyMac takes only a few minutes. Download CleanMyMac for free, launch it, click Scan, and then Clean. Now you’ve got plenty of free space and your Mac is free from system trash.
Step 2: Back up your data
Note: A clean install of macOS Sierra on the startup drive completely erases all data on that drive: all your files and documents, including music, movies, pictures, and even apps.
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To backup your Mac:
Step 3: Clean Install macOS Sierra on your startup disk
1. Create a bootable flash drive with macOS Sierra.
First, make sure your USB flash drive is formatted and named as “Untitled”.
Now, your USB flash drive is ready.
Also, you can follow the instructions from an Apple article on how to create bootable installer.
2. Plug in the bootable macOS Sierra installer USB drive to your Mac.
3. Restart your Mac while holding the Option key or Cmd+R. Make sure to keep it pressed! 4. When Mac restarts, you’ll see the macOS Startup Manager with a list of bootable devices that your Mac can start up from. 5. Use the arrow keys to choose your USB drive with macOS Sierra installer. Press Enter. 6. Select Disk Utility. 7. In the window, at the top of the left bar, select your Mac’s Main Drive (it looks like a MacintoshHD). 8. Select the Erase tab located next to the First Aid button at the top. 9. Near the center of the window, select the Format drop-down list and select Mac OS X Extended (Journaled) type. 10. Click Erase (Note: this will erase all your data from your main drive!) and give the drive some time to format. 11. When it’s done, close Disk Utility and select “Install macOS” from the menu. 12. Select your main drive and install the new macOS Sierra 10.12.
Follow these Sierra install instructions and enjoy your newly clean-installed macOS Sierra.
Clean Install on a Non-Startup Drive
This type of clean install doesn't require you to make a bootable copy of the macOS installer, since you can run the installer directly from your Mac’s startup drive. But you need to have another hard drive or volume that you can use for installing macOS.
So, this is the easiest way to clean install macOS 10.12. Simply use an extra drive or volume (it doesn’t have to necessarily be empty already, you just need to be fine with it being erased) and install Sierra there.
Step 1: Erase your non-startup drive
If your non-startup drive has any other Mac OS, erase it before installing Sierra. If the target drive only has personal data on it, or is already empty, you can skip the erase process.
To erase the non-startup drive, use a Mac's Drive Using Disk Utility (OS X El Capitan or later)
Download Mac Os For Reinstall
After the non-startup drive is erased, you can start the install process.
Step 2: Download the macOS Sierra Installer from the Mac App Store
When the macOS download completes, it will automatically launch the installer. Quit the macOS Sierra Installer app without performing the installation. You'll find the macOS Sierra Installer in the /Applications folder.
Step 3: Start the Installation of macOS Sierra on the Non-startup driveMac Os X Install Disk
Enjoy your fresh, clean-installed macOS Sierra.
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