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.
Reinstall from 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.
This answer, the currently top-rated one on the original original, assumes the hard drive you wish to replace works and that you can boot your Mac using it. This answer tho provides instructions when the hard drive being replaced is not working. – Kenny Evitt Oct 28 '17 at 16:34.
Command (⌘)-R
Reinstall the latest macOS that was installed on your Mac (recommended).
![]() 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.
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
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.
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 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
Erasing your disk: For most reasons to erase, including when reformatting a disk or selling, giving away or trading in your Mac, you should erase your entire disk.
Erasing a volume on your disk: In other cases, such as when your disk contains multiple volumes (or partitions) and you don't want to erase them all, you can erase specific volumes on the disk.
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Erasing a disk or volume permanently deletes all of its files. Before continuing, make sure that you have a backup of any files that you want to keep.
How to erase your disk
After Hard Drive Erase Mac Os Fails To Install MacHow to erase a volume on your disk
After Hard Drive Erase Mac Os Fails To Install SoftwareReasons to erase
You can erase at any time, including in circumstances such as these:
About APFS and Mac OS Extended
Disk Utility in macOS High Sierra or later can erase using either the newer APFS (Apple File System) format or the older Mac OS Extended format, and it automatically chooses a compatible format for you.
How to choose between APFS and Mac OS Extended
Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. If it can’t, it chooses Mac OS Extended, which works with all versions of macOS. If you want to change the format, answer these questions:
To mount and make the internal recovery partition visible you have to first by typing the following command at terminal. defaults write com.apple.DiskUtility DUDebugMenuEnabled 1 killall Finder. After typing the above command quit the disk utility and reopen it and you should see the debug menu at top. Mac os recover partition on usb drive.
How to identify the format currently being used
If you want to know which format is currently in use, use any of these methods:
After Hard Drive Erase Mac Os Fails To Install Windows 7If your disk or volume doesn't appear or the erase process failsAfter Hard Drive Erase Mac Os Fails To Install Windows 10
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