How mac os is made

How to reinstall macOS

Use macOS Recovery to reinstall the Mac operating system.

Start up from macOS Recovery

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

Make sure that your Mac has a connection to the internet. Then 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

Select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.

Follow these guidelines during installation:

• If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
• If the installer doesn’t see your disk, or it says that it can’t install on your computer or volume, you might need to erase your disk first.
• If the installer offers you the choice between installing on Macintosh HD or Macintosh HD — Data, choose Macintosh HD.
• Allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.

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:

• On an Intel-based Mac: If you use Shift-Option-Command-R during startup, you’re offered the macOS that came with your Mac, or the closest version still available. If you use Option-Command-R during startup, in most cases you’re offered the latest macOS that is compatible with your Mac. Otherwise you’re offered the macOS that came with your Mac, or the closest version still available.
• If the Mac logic board was just replaced, you may be offered only the latest macOS that is compatible with your Mac. If you just erased your entire startup disk, you may be offered only the macOS that came with your Mac, or the closest version still available.

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

• Use the App Store to download and install the latest macOS.
• Use the App Store or a web browser to download and install an earlier macOS.
• Use a USB flash drive or other secondary volume to create a bootable installer.

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Создание загружаемого установщика для macOS

В качестве загрузочного диска для установки операционной системы на компьютер Mac можно использовать внешний диск или дополнительный том.

Эти расширенные инструкции предназначены в первую очередь для системных администраторов и других пользователей, имеющих опыт работы с командной строкой. Загружаемый установщик не требуется для обновления macOS или переустановки macOS, но он может оказаться удобен, если требуется выполнить установку на несколько компьютеров, не загружая установщик заново каждый раз.

Что нужно для создания загружаемого установщика:

• USB-накопитель или другой дополнительный том, отформатированный в Mac OS Extended, на котором есть не менее 14 ГБ свободного пространства;
• загруженный установщик для macOS Big Sur, Catalina, Mojave, High Sierra или El Capitan.

Загрузка macOS

• Загрузка macOS Big Sur, macOS Catalina, macOS Mojave или macOS High Sierra
  Эти элементы загружаются в папку «Программы» в виде приложения с именем «Установка macOS [ название версии ]». Если после загрузки запустится установщик, завершите его работу без продолжения установки. Чтобы получить подходящий установщик, выполняйте загрузку с компьютера Mac, на котором используется macOS Sierra 10.12.5 или более поздней версии либо El Capitan 10.11.6. Корпоративным администраторам следует производить загрузку с сайта Apple, а не с сервера обновления ПО, размещенного в локальной сети.
• Загрузка OS X El Capitan
  В результате этого действия загрузится образ диска с именем InstallMacOSX.dmg. На компьютере Mac, совместимом с El Capitan, откройте образ диска и запустите с него установщик с именем InstallMacOSX.pkg. Приложение с именем «Установка OS X El Capitan» будет установлено в папку «Программы». Загружаемый установщик создается именно из этого приложения, а не из образа диска или установщика .pkg.

Использование команды createinstallmedia в приложении «Терминал»

1. Подключите USB-накопитель или другой том, используемый для загружаемого установщика.
2. Откройте приложение «Терминал» в подпапке «Утилиты» папки «Программы».
3. Введите или вставьте в приложение «Терминал» одну из следующих команд. Предполагается, что установщик находится в папке «Программы», а имя MyVolume обозначает USB-накопитель или другой используемый вами том. Укажите вместо MyVolume имя своего тома в следующих командах.

Big Sur*:

Catalina*:

Mojave*:

High Sierra*:

El Capitan:

* Если на компьютере Mac установлена операционная система macOS Sierra или более ранней версии, включите аргумент —applicationpath и путь установки аналогично тому, как это делается в случае команды для El Capitan.

После набора команды

1. Нажмите «Ввод», чтобы ввести команду.
2. При появлении запроса введите пароль администратора и нажмите клавишу «Ввод» еще раз. При вводе пароля приложение «Терминал» не отображает вводимые символы.
3. При появлении запроса нажмите клавишу Y , чтобы подтвердить удаление всех данных на томе, затем клавишу «Ввод». Приложение «Терминал» показывает прогресс по мере стирания тома.
4. После стирания тома может быть отображено предупреждение о том, что приложению «Терминал» требуется доступ к файлам на съемном томе. Нажмите «OK», чтобы продолжить копирование.
5. Когда приложение «Терминал» сообщит о завершении процесса, имя тома будет совпадать с именем загруженного установщика, например «Установка macOS Big Sur». После этого можно закрыть приложение «Терминал» и извлечь том.
   

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How to get old versions of macOS

If your Mac isn’t compatible with the latest macOS, you might still be able to upgrade to an earlier macOS, such as macOS Catalina, Mojave, High Sierra, Sierra, or El Capitan.

To get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it’s important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.

Check compatibility

The version of macOS that came with your Mac is the earliest version it can use. For example, if your Mac came with macOS Big Sur, it will not accept installation of macOS Catalina or earlier.

If a macOS can’t be used on your Mac, the App Store or installer will let you know. For example, it might say that it’s not compatible with this device or is too old to be opened on this version of macOS. To confirm compatibility before downloading, check the minimum hardware requirements:

Download macOS using Safari on your Mac

Safari uses these links to find the old installers in the App Store. After downloading from the App Store, the installer opens automatically.

• macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks
• macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
• macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion

Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [ Version Name ]. Open that app from your Applications folder to begin installing the operating system.

• macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion
• OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard
• OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard

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What to do before you sell, give away, or trade in your Mac

Back up your data, then restore to factory settings by turning off certain features and services, erasing your Mac, and reinstalling macOS.

Moving to a new Mac? Before taking these steps, you can use Migration Assistant to move your files from the old Mac to your new Mac.

Create a backup

Make sure that you have a current backup of your important files. Learn how to back up your Mac.

Sign out of iTunes in macOS Mojave or earlier

If you’re using macOS Mojave or earlier, open iTunes. From the menu bar at the top of the screen or iTunes window, choose Account > Authorizations > Deauthorize This Computer. Then enter your Apple ID and password and click Deauthorize.

Learn more about deauthorizing computers used with your iTunes account.

Sign out of iCloud

If you’re using macOS Catalina or later, choose Apple menu  > System Preferences, then click Apple ID. Select Overview in the sidebar, then click Sign Out.

If you’re using macOS Mojave or earlier, choose Apple menu  > System Preferences, click iCloud, then click Sign Out.

You will be asked whether to keep a copy of your iCloud data on this Mac. You can click Keep a Copy, because you’re erasing your Mac later. Your iCloud data remains in iCloud and on any other devices that are signed in to iCloud with your Apple ID.

Sign out of iMessage

If you’re using OS X Mountain Lion or later, open the Messages app, then choose Messages > Preferences from the menu bar. Click iMessage, then click Sign Out.

Reset NVRAM

Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. Release the keys after about 20 seconds. This clears user settings from memory and restores certain security features that might have been altered.

Optional: Unpair Bluetooth devices that you’re keeping

If your Mac is paired with a Bluetooth keyboard, mouse, trackpad, or other Bluetooth device that you plan to keep, you can unpair it. This optional step prevents accidental input when the Mac and device have separate owners but remain in Bluetooth range of each other.

If you’re unpairing Bluetooth input devices from a desktop computer such as an iMac, Mac mini, or Mac Pro, you must plug in a USB keyboard and mouse to complete the remaining steps in this article.

To unpair a Bluetooth device, choose Apple menu  > System Preferences, then click Bluetooth. Move your pointer over the device that you want to unpair, then click the remove (x) button next to the device name.

Erase your hard drive and reinstall macOS

The best way to restore your Mac to factory settings is to erase your hard drive and reinstall macOS.

After macOS installation is complete, the Mac restarts to a setup assistant that asks you to choose a country or region. To leave the Mac in an out-of-box state, don’t continue setup. Instead, press Command-Q to shut down the Mac. When the new owner turns on the Mac, the setup assistant guides them through the setup process.

No matter the model or condition, we can turn your device into something good for you and good for the planet: Learn how to trade in or recycle your Mac with Apple Trade In.

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Mac OS

Our editors will review what you’ve submitted and determine whether to revise the article.

Mac OS, operating system (OS) developed by the American computer company Apple Inc. The OS was introduced in 1984 to run the company’s Macintosh line of personal computers (PCs). The Macintosh heralded the era of graphical user interface (GUI) systems, and it inspired Microsoft Corporation to develop its own GUI, the Windows OS.

Apple’s marketing for the introduction of the Macintosh focused heavily on its operating system’s intuitive ease of use. Unlike virtually all other contemporary PCs, the Mac OS (initially designated simply System Software, with a version number appended) was graphically based. Rather than typing commands and directory paths at text prompts, users moved a mouse pointer to visually navigate the Finder—a series of virtual folders and files, represented by icons. Most computer operating systems eventually adopted the GUI model. In the 1980s Apple made an agreement allowing Microsoft to use certain aspects of the Mac interface in early versions of Windows. However, except for a brief period in the 1990s, Mac OS has never been licensed for use with computers made by manufacturers other than Apple.

Later Mac OS releases introduced features such as Internet file sharing, network browsing, and multiple user accounts. In 1996 Apple acquired rival NeXT Computers, which was founded by Steven Jobs after his departure from Apple, and in 2001 the company rolled out Mac OS X, a major redesign based on both the NextStep system and Apple’s most recent OS release. OS X ran on a UNIX kernel (core software code) and offered technical advances such as memory protection and preemptive multitasking, along with a more versatile Finder, an elegant-looking interface called Aqua, and a convenient graphical “Dock” bar for launching frequently used applications. Updates to OS X added features such as automated backups and a “Dashboard” manager for small, handy applications called widgets.

From 2007 Apple unveiled a number of mobile devices that could access the Internet, including the iPhone smartphone and the iPad tablet computer. Apple soon emphasized the ability of OS X to connect with these devices. In 2011 Apple introduced iCloud, a cloud computing service that allowed users to share data among all of their Apple devices, for both OS X and the mobile operating system iOS. Apple added more features allowing connectivity between devices to successive updates of OS X, iOS, and later watchOS (the operating system for the Apple Watch smartwatch). These features included the ability to receive phone calls (made to the iPhone) and the means of quickly sharing data (such as photos and text) among devices.

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