These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.
What you need to create a bootable installer
- A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage
- A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan
Download macOS
- Easily check which versions of mac OS, iOS, iPadOS, or watchOS are compatible with your Mac model or iDevice. Guide includes OS X 10.8.x to macOS 11.0.x.
- If your Mac is using a firmware password, you're prompted to enter the password. Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. If your Mac is using a firmware password, you're prompted to enter the password. Option-Command-P-R: Reset NVRAM or PRAM.
- Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra
These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server. - Download: OS X El Capitan
This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.
Moving from your PC to your new Mac? Consider it done. With macOS, you can move all the information from your old PC to your new Mac. Built-in Windows-to-Mac migration in macOS automatically transfers your documents, music, contacts, calendars, and email accounts (Outlook and Windows Live Mail), and puts them in the appropriate folders and applications on your new Mac.
Use the 'createinstallmedia' command in Terminal
- Connect the USB flash drive or other volume that you're using for the bootable installer.
- Open Terminal, which is in the Utilities folder of your Applications folder.
- Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace
MyVolumein these commands with the name of your volume.
Big Sur:*
Catalina:*
Mojave:*
High Sierra:*
El Capitan:
* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.
After typing the command:
- Press Return to enter the command.
- When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
- When prompted, type
Yto confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased. - After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
- When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.
Use the bootable installer
Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:
Apple silicon
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- Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
- Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
- Select the volume containing the bootable installer, then click Continue.
- When the macOS installer opens, follow the onscreen instructions.
Intel processor
- Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
- Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
- Release the Option key when you see a dark screen showing your bootable volumes.
- Select the volume containing the bootable installer. Then click the up arrow or press Return.
If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media. - Choose your language, if prompted.
- Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.
Learn more
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A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.
For information about the createinstallmedia command and the arguments you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal:
Moving from your PC to your new Mac? Consider it done.
With macOS, you can move all the information from your old PC to your new Mac. Built-in Windows-to-Mac migration in macOS automatically transfers your documents, music, contacts, calendars, and email accounts (Outlook and Windows Live Mail), and puts them in the appropriate folders and applications on your new Mac. Just like that.
If you buy your Mac at an Apple Store, Personal Setup can help you get off to a great start.
Work with anyone.
Every Mac comes with Pages, Numbers, and Keynote — powerful productivity apps from Apple that help you create stunning documents, spreadsheets, and presentations. You can collaborate with one person or many people to create and edit Pages, Keynote, and Numbers files. And everyone can work on the same document at the same time — from across town or across the globe. You can also open, edit, and save Microsoft Word, Excel, and PowerPoint files with these apps, so you can easily work with others, regardless of whether they're on a Mac or PC.
Use Microsoft Office for Mac. Connect to Microsoft Exchange Server.
Fun fact: There's a version of Microsoft Office written just for Mac. So you can use Word, Excel, and PowerPoint on a Mac just like on a PC.
With macOS, you can move all the information from your old PC to your new Mac. Built-in Windows-to-Mac migration in macOS automatically transfers your documents, music, contacts, calendars, and email accounts (Outlook and Windows Live Mail), and puts them in the appropriate folders and applications on your new Mac. Just like that.
If you buy your Mac at an Apple Store, Personal Setup can help you get off to a great start.
Work with anyone.
Every Mac comes with Pages, Numbers, and Keynote — powerful productivity apps from Apple that help you create stunning documents, spreadsheets, and presentations. You can collaborate with one person or many people to create and edit Pages, Keynote, and Numbers files. And everyone can work on the same document at the same time — from across town or across the globe. You can also open, edit, and save Microsoft Word, Excel, and PowerPoint files with these apps, so you can easily work with others, regardless of whether they're on a Mac or PC.
Use Microsoft Office for Mac. Connect to Microsoft Exchange Server.
Fun fact: There's a version of Microsoft Office written just for Mac. So you can use Word, Excel, and PowerPoint on a Mac just like on a PC.
macOS also provides built-in support for the latest version of Microsoft Exchange Server. So you can use all the apps you love on your Mac, and have access to your mail, contacts, and calendar from the office, all at the same time.
Access your files from anywhere with iCloud.
Your Mac comes with iCloud Drive, which lets you safely store all your presentations, spreadsheets, PDFs, images, and any other kinds of files in iCloud. Then you can access them from any device, including your iPhone, iPad, iPod touch, Mac, or PC.1
Industry standard‑bearer.
Factower Mac Os X
Thanks to its support for industry standards, macOS works with virtually all email providers and websites. It also lets you view the most common file types, including Office documents, PDFs, images, text files, MP3s, videos, ZIP files, and more.
So if you're moving files from a PC or if your friends and colleagues send you files, you can rest assured they'll work beautifully on your Mac.
Relax. Your camera, printer, and mouse work, too.
Almost any device that connects to a computer via USB, audio cable, or Bluetooth will work with a Mac. That includes digital cameras, external hard drives, printers, keyboards, speakers, and even your right-click mouse. And with technologies like AirPrint and the array of class drivers included with macOS, you can start using these devices as soon as you plug them in — no need to manually download additional software.
A Mac can even run Windows.
Have a Windows application you need to use once in a while? No problem. Every new Mac lets you install and run Windows at native speeds, using a built-in utility called Boot Camp.
Setup is simple and safe for your Mac files. After you've completed the installation, you can boot up your Mac using either macOS or Windows. (That's why it's called Boot Camp.) Or if you want to run Windows and Mac applications at the same time — without rebooting — you can install Windows using VMware or Parallels software.2
Connect to PCs over a network.
Factower Mac Os Catalina
The Finder not only lets you browse files on your Mac, it also makes it easy to find files on other computers — both Mac and PC — on your home network. Computers that allow file sharing automatically show up in the Shared section of the Finder sidebar, allowing you to browse files and folders you have permission to view.
Works on macOS
- Microsoft Office for Mac and Word, Excel, and PowerPoint documents created on a Mac or PC
- Windows using Boot Camp or third-party software
- Access to Microsoft Exchange Server in Mail, Contacts, and Calendar
- Virtually all email services and providers
- Popular file types such as PDF, JPG, ZIP, MP3, PSD, and more
- Digital cameras, printers, hard drives, mice, and keyboards with USB connections
- Wi‑Fi hotspots and Windows networks
- Text messaging with Skype, Facebook, WeChat, LINE, and more
