How to install mac os on mac os

Переустановка macOS

С помощью встроенной системы восстановления Mac — режима восстановления macOS — можно переустановить macOS, при этом все Ваши файлы и пользовательские настройки сохраняются.

Важно! Для переустановки macOS компьютер должен быть подключен к интернету.

Запустите компьютер в режиме восстановления macOS.

На Mac с процессором Apple. Выберите меню Apple

> «Выключить», нажмите и удерживайте кнопку питания, пока не появится надпись «Загрузка параметров запуска», выберите «Параметры», нажмите «Продолжить», затем следуйте инструкциям на экране.

На Mac с процессором Intel. Выберите меню Apple

> «Перезагрузить», затем сразу же нажмите и удерживайте одно из следующих сочетаний клавиш (в зависимости от желаемого действия).

Установка новейшей версии macOS, совместимой с Вашим компьютером. Option-Command-R.

Переустановка той версии macOS, которая была установлена на компьютере (включая доступные обновления). Option-Shift-Command-R.

Переустановка текущей версии macOS. Command-R.

В окне приложения «Восстановление» выберите «Переустановить» для Вашей версии macOS, затем нажмите «Продолжить».

Следуйте инструкциям на экране. На панели выбора тома выберите том, на котором установлена macOS (в большинстве случаев он будет единственным доступным диском).

На компьютере Mac с чипом Apple или на компьютере Mac с процессором Intel и чипом безопасности Apple T2 Security Chip можно использовать Ассистент стирания для восстановления заводских настроек Mac перед обменом или продажей устройства. Стирание данных с компьютера Mac.

How to reinstall macOS

Use macOS Recovery to reinstall the Mac operating system.

Start up from macOS Recovery

First make sure that your Mac has a connection to the internet. Then determine whether you’re using a Mac with Apple silicon and follow the appropriate steps:

Apple silicon

Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labeled Options, then click Continue.

Intel processor

Turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

If you’re asked to select a user you know the password for, select the user, click Next, then enter their administrator password.

Reinstall macOS

Reinstalling macOS does not remove data from your Mac. To begin installation, select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.

Follow these guidelines during installation:

After installation is complete, your Mac might restart to a setup assistant. If you’re selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.

Other macOS installation options

When you install macOS from Recovery, you get the current version of the most recently installed macOS, with some exceptions:

You can also use these methods to install macOS, if the macOS is compatible with your Mac:

Use more than one version of macOS on a Mac

If you install a compatible macOS on a new volume of your built-in startup disk, your Mac can start up from either volume. It’s an easy way to use a newer macOS while keeping a previously installed macOS for software that might require it.

Make a backup

Back up your Mac, especially if you plan to install a beta version of macOS. Beta software is software that is still in development, so some apps and services might not work as expected.

Add an APFS volume

Install a compatible macOS on the new volume

If the macOS that you want to install is compatible with your Mac, you can install it on the new volume.

When the installer opens and you’re asked to choose where to install, click Show All Disks, then select the new volume before continuing.

Switch between macOS versions

To switch between installed macOS versions, just start up your Mac from the other volume. You can do that by changing your Mac startup disk.

When you first start up from a new volume, a setup assistant helps you to create a new user account. User accounts are not shared between volumes, but you can share files between user accounts.

Keep macOS up to date on each volume

To get the latest updates for each version of macOS, check for software updates, then start up from the other volume and check for software updates again.

Delete a volume

If you want to delete a volume, including the macOS and all other data on that volume, follow these steps.

How to reinstall macOS

Use macOS Recovery to reinstall the Mac operating system.

Start up from macOS Recovery

First make sure that your Mac has a connection to the internet. Then determine whether you’re using a Mac with Apple silicon and follow the appropriate steps:

Apple silicon

Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labeled Options, then click Continue.

Intel processor

Turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

If you’re asked to select a user you know the password for, select the user, click Next, then enter their administrator password.

Reinstall macOS

Reinstalling macOS does not remove data from your Mac. To begin installation, select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.

Follow these guidelines during installation:

After installation is complete, your Mac might restart to a setup assistant. If you’re selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.

Other macOS installation options

When you install macOS from Recovery, you get the current version of the most recently installed macOS, with some exceptions:

You can also use these methods to install macOS, if the macOS is compatible with your Mac:

How to Reinstall OS X on a Mac

Though we’d all rather everything works as intended with our Macs, occasionally something goes really haywire and OS X becomes either royally messed up or unusable. In these circumstances, sometimes the only solution to get things working again is to reinstall OS X system software (or, if you have a recent safe backup made, restoring from Time Machine is often valid as well).

We’ll cover how to reinstall Mac OS X system software only with Recovery Mode, this reinstalls the most recently available version of OS X that is (or was) actively running on the Mac. If performed correctly as described, applications and user data will be preserved and not be modified at all, since this approach only reinstalls the operating system and system files.

Update: this article pertains specifically to reinstalling OS X on Macs, including El Capitan, Yosemite, and Mavericks. Newer MacOS releases also support the ability to re-install only macOS while leaving user files alone, however. If interested you can read how for macOS Mojave and High Sierra and Sierra. The premise is mostly the same; booting into Recovery mode to reinstall the system software.

Note how this is different from re-installing OS X with Internet Recovery, which loads entirely from the internet, and then reinstalls the original version of OS X which came with the Mac instead, that method is sometimes necessary if the standard recovery option doesn’t load, or if you want to reinstall the original version of OS X for the computer in question. This is also completely different from a clean install of OS X, which is performed by erasing a Mac drive and then starting fresh with a new clean installation of the Mac OS X system software.

Before getting started, you’ll want to be sure you have a fast and stable internet connection available for the Mac, this is because the installer files for OS X download from Apple. Trying to reinstall OS X through a flakey or slow internet connection is not recommended, unless you were to use a bootable install drive or something similar where downloading reinstallation components is not necessary. You’ll also want to set aside at least an hour or two to complete this process, the exact time it takes depends on the speed of the internet connection in use, and the speed of the Mac.

Reinstalling OS X System Software on a Mac with Recovery Mode

It’s a good idea to back up the Mac with Time Machine before beginning this process. Even though this method aims to only reinstall OS X system software on the Mac, things could still go wrong and it’s always better to lean on the side of caution and make file backups beforehand.

When reinstallation completes, the Mac will reboot itself again as normal, and you’ll be presented again with the typical login screen associated with OS X – log in to your user account as usual and everything should be in order, complete with a new install of OS X system software on the computer.

As long as you didn’t erase the drive or delete any user accounts yourself, all user accounts, installed applications, and user data will be preserved, and only Mac OS X system software and system files will have been reinstalled without touching anything else on the Mac. If desired, you can use the  Apple menu > About This Mac screen to verify the version of OS X that has been reinstalled:

* If you get an error message about being unable to reinstall OS X because the Mac isn’t connected to the internet, you need to join a wi-fi network or connect via ethernet. The installer must download from Apple for this to work.

This works to reinstall OS X exactly as described, I had to run through this process recently when I encountered probably the worst and most bizarre bugs I’ve ever seen in OS X, where “Macintosh HD” became stuck in the Trash can and actually started deleting system level files when emptied, which as you can imagine leads to all sorts of problems with the operating system missing critical components. While it’s unlikely you’ll ever encounter such a bug yourself, it is possible for users to mess up their system folders if they have disabled SIP or are using root, if the startup Mac OS volume has been erased or misplaced, if a prohibitory symbol is encountered at startup (sometimes a folder with an X through it, or a folder with a blinking question mark), or if the OS X installation is erroneous or royally messed up.

Remember, this method is not the same as a clean install, and it only reinstalls the version of OS X that is currently running on the Mac (shown here with El Capitan), whereas Internet Recovery will reinstall the version of OS X that shipped with the Mac (in this case it would have been Yosemite) instead. Obviously the versions of OS X will vary depending on what came with the Mac, and what the Mac is currently running.

While this article describes this system reinstall process with OS X versions specifically, you can also read how to re-install only macOS Mojave while leaving user files alone and for re-installing MacOS High Sierra and Sierra in the same way too. The premise is mostly the same; booting into Recovery mode to reinstall the system software. Regardless of what Mac or Mac OS version you are trying this with, always backup the computer beforehand.