Reinstall from macOS Recovery
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- The most important restriction is this: Although you can use Disk Utility to test the drive you’re using (and, as you’ve seen, fix permissions), you can’t repair it until you boot from another disc. This disc is most likely your Mac OS X installation CD or DVD, which you will need if you’re using an older version of OS X.
- The top 5 disk formatting tools for Windows and Mac can help you securely format hard drive or external device under Windows/Mac OS. AweEraser is the outstanding one among the 5 disk formatting tools. It will securely format the hard drive and permanently erase the data. Then your hard drive is able to donated, resold, lent, or abandoned.
MacOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu, which is also available in macOS Recovery.
macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu , which is also available in macOS Recovery.
1. Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on your keyboard. Release the keys when you see an Apple logo, spinning globe, or other startup screen.
Command (⌘)-R
Reinstall the latest macOS that was installed on your Mac (recommended).
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Messages app on mac not syncing with iphone.
Option-⌘-R
Upgrade to the latest macOS that is compatible with your Mac.
Shift-Option-⌘-R
Reinstall the macOS that came with your Mac, or the closest version still available.
You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.
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When you see the utilities window, you have started up from macOS Recovery.
2. Decide whether to erase (format) your disk
You probably don't need to erase, unless you're selling, trading in, or giving away your Mac, or you have an issue that requires you to erase. If you need to erase before installing macOS, select Disk Utility from the Utilities window, then click Continue. Learn more about when and how to erase.
3. Install macOS
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When you're ready to reinstall macOS, choose Reinstall macOS from the Utilities window. Then click Continue and follow the onscreen instructions. You will be asked to choose a disk on which to install.
- 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 is for a different version of macOS than you expected, learn about macOS Recovery exceptions.
- If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
If your Mac restarts to a setup assistant, but 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.
macOS Recovery exceptions
The version of macOS offered by macOS Recovery might vary in some cases:
- If macOS Sierra 10.12.4 or later has never been installed on this Mac, Option-Command-R installs the macOS that came with your Mac, or the closest version still available. And Shift-Option-Command-R isn't available.
- If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might offer only the macOS that came with your Mac, or the closest version still available. You can upgrade to a later version afterward.
- If your Mac has the Apple T2 Security Chip and you never installed a macOS update, Option-Command-R installs the latest macOS that was installed on your Mac.
- If you just had your Mac logic board replaced during a repair, macOS Recovery might offer only the latest macOS that is compatible with your Mac.
If you can't get macOS Recovery to offer the installer you want, you might be able to use one of the other ways to install macOS.
Other ways to install macOS
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- You can also install macOS from the App Store or Software Update preferences. If you can't install macOS Catalina, you might be able to install an earlier macOS, such as macOS Mojave, High Sierra, Sierra, El Capitan, or Yosemite.
- Or create a bootable installer disk, then use that disk to install macOS on your Mac or another Mac.
Just about every championship baseball team has a valuable utility player to fill nearly every position. The versatile Disk Utility tool on your Mac serves this purpose for all things hard drive–related and many things optical drive–related. At a glance, it gives you a summary of your drives, including disk capacity, available space, and number of files and folders.
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If you suspect that your hard drive is actually damaged (even a reboot doesn’t seem to do much good), run Verify Disk to uncover any errors. If you find any, you must be an administrator to authorize a repair. You can’t repair (or even test) write-protected disks and nonrecordable CDs and DVDs.
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The most important restriction is this: Although you can use Disk Utility to test the drive you’re using (and, as you’ve seen, fix permissions), you can’t repair it until you boot from another disc. This disc is most likely your Mac OS X installation CD or DVD, which you will need if you’re using an older version of OS X.
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With that in mind, it’s a good idea to make a copy of your installation disc right now and stash it in a safe place. (On newer systems with Mountain Lion or Mavericks, you no longer have a disc to install the operating system.)
After booting with this other disc, open Disk Utility, select your startup disk, and click Repair Disk. Incidentally, booting from the other disc is somewhat tricky. To do so, hold down the C key and wait until OS X boots. Make a language selection, and choose Disk Utility from the menu.