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Apple releases macOS Sierra 10.12 for all Mac users; learn how to update [atualizado 2x]

Apple just released the macOS Sierra 10.12 (build 16A323) for all Mac users! Ma's new operating system is available on the Mac App Store for free and requires a 4.8GB download (in its full version).

MacOS Sierra app icon

Announced at the Worldwide Developers Conference (WWDC) 2016, macOS Sierra finally comes with Siri, Continuity improvements including a Universal Transfer area, greater integration with iCloud, Memories in the Photos app, Mac unlock with Apple Watch, support for Apple Pay, tabs spread across various apps, feature Picture-in-Picture (PiP) embedded, among others.

Read more about it:

But are you ready to install? Know your options here.

Distribution of OS X macOS

For some good years, when you bought a new Mac or purchased a new operating system, you received an installation CD / DVD.

Mac OS X Snow Leopard 10.6 box

We are in the middle of the 21st century, and now the distribution is practically immediate via the Mac App Store, allowing a greater number of users to have the most updated version as soon as possible (but creating a huge dependency on the internet, given the size of the download. ).

If you have more than one Mac or simply want to have a new macOS installation disc, this article is for you! When you create a boot disk, the download becomes unique and installation on other machines is much faster. If you intend to install from scratch (clean), this process will also make your life a lot easier.


Make sure your Mac is compatible with the new version of macOS. To install Sierra, you need minimally OS X 10.7.5, 2GB of RAM and 8.8GB of available storage space.

MacOS Sierra messages on a MacBook

The new system itself is compatible with the following Macs:

  • MacBook (late 2009 or later)
  • MacBook (late 2009 or later)
  • MacBook Pro (mid 2010 or later)
  • MacBook Air (late 2010 or later)
  • Mac mini (mid 2010 or later)
  • iMac (late 2009 or later)
  • Mac Pro (mid 2010 or later)

As always, not all features work on all machines to find out if your Mac is compatible with Handoff, Instant Hotspot or the Universal Transfer area, for example, see this page from Apple.


If you have an external HDD or an AirPort Time Capsule, the most recommended option for backup comes under a nice name: Time Machine.

Backing up via Time Machine

To activate the feature, go to Time Machine System Preferences, choose the location to save your backup (your external HDD) and that's it! Now just wait for the backup to be done which can take a long time depending on the amount of files / applications you have. The entire process, once activated, starts to be done automatically and you no longer need to worry about anything.

If you don't want to save all the files on your Mac, the other option is to manually drag your folders (Documents, Downloads, Movies, Music, Images, etc.), sources and everything else that you think is important for your external HDD.

Types of installations

Whenever a new operating system for Macs launched by Apple, many users are unsure about how to install it. Is it worth upgrading over the current system? Or is it more of a game to do a clean install, leaving everything zero so that the new OS X macOS can show its full potential without the garbage accumulated for months / years? Both options (conventional and clean installation) have positive and negative points.

The most popular option is the simplest: installation over the current system. In addition to being faster than a clean installation, this form still has the benefit of keeping all your files the way they are (documents, photos, videos, music, apps, etc.), ready to be used (provided they are compatible with the new system in the case of apps, for example). The negative point of this model is due to the excess of problems and the junk of useless information that often accompanies your new system, especially for those who have been doing conventional updates since older systems, such as OS X Mountain Lion.

The clean installation, on the other hand, gives you a completely new, zeroed system. This often reflects a better performance; on the other hand, you need more time and patience, after all you have to transfer all your documents, photos, videos, music, apps and everything else manually after the installation is completed so that, yes, you can use your ?new? Mac.

In this science there is no right or wrong, but the option that best suits your needs. I usually update the system in the conventional way, but I take the opportunity to check my files and sort through the things I really need. If your choice is a clean installation, remember again: backup of your information before proceeding with the installation of macOS Sierra!

How to install clean

  1. Make sure your Personal files are all backed up in a secure backup, either on an external HDD that can be connected directly to your Mac or on your local / corporate network.
  2. Keep your machine in a location with easy internet access and preferably with a good connection speed.
  3. Do not unplug your machine from the wall outlet during the update / reinstallation process.


You can use an external HDD, a USB stick or an SD card (if your Mac has a slot for cards) to be your boot disk. Choose a disc that can be erased, as this is one of the first steps in the process.

You will be able to choose one of the two ways to create your installation disc, using applications or through the Terminal itself.


Both the DiskMaker X how much Disk Creator they are free and a hand on the wheel if you are not very familiar with the Terminal (although it is a very simple process to do everything for it, too). The process described for creating the macOS Sierra disk is also valid for other versions of the system, it is worth mentioning.

Both have instructions for the process of creating the disc, just follow the step by step.


If you have already finished downloading macOS Sierra from the Mac App Store, you have separated the external HDD / pendrive / SD card and want to use the Terminal to create your boot disk, just follow the steps below (in this example, the external disk has the name):

  1. With your external disk connected to your Mac, open the Terminal (located in / Applications / Utilities /);
  2. Copy and paste the following command in the Terminal window:
sudo /Applications/Install macOS --volume /Volumes/ --applicationpath /Applications/Install macOS
  1. The Terminal asks for your user password. Enter it and press Enter;
  2. You will be warned that your external drive will be erased. To confirm, press Y (for ?Yes?) and then Enter;
  3. After your disk is erased, Time Machine will ask if you want to use it as a backup disk; click on ?No Use?;
  4. Terminal copies the installation files to your external disk in a process that will take a few good minutes;
  5. When the process is complete, the message ?Copy Complete? appears in the Terminal window.

Erasing your Mac and installing the system

  1. Restart the computer by holding down the key (Option) during the reset;
  2. Select the external disk created in the Terminal;
  3. Select the Disk Utility and click "Continue";
  4. Select the Macintosh HD in the left list and click on the ?Delete? tab;

How to erase the disc in Disk Utility

  1. In the "Format" pop-up menu, choose the option "Mac OS Expanded (Reg. Chronological)", type a name for your disk (Macintosh HD) and click "Delete";
  2. After the disc is erased, exit Disk Utility;
  3. Select "Reinstall macOS" and follow the instructions on the screen.

After installation is complete, add your files back to your Mac, either by retrieving them from Time Machine or by dragging them from your external drive.

iCloud Drive from macOS Sierra on a MacBook next to the app running on iPad and iPhone

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And, what was your choice? Be sure to share it with us and other readers of how you installed it and if you ran into any problems in the upgrade process for macOS Sierra. ?

Update by Rafael Fischmann · 09/20/2016 s 16:40

Apple has published a full support article detailing the security fixes for macOS Sierra 10.12.

Update II, by Rafael Fischmann · 09/20/2016 s 16:43

Today also came the macOS Server 5.2, bringing news to Profile Manager, Caching Server, SMB, NFS and Xsan 5.

MacOS Server app icon