Jun 16, 2020 Accidentally Erased Hard Drive on Mac. You may use Disk Utility application to perform hard drive partition-related tasks on Mac Operating System, such as to format, repair, erase or create hard drive partitions and end up with an erased hard drive. Moreover, by doing so, crucial data may be deleted by mistake from your Mac.
Whether it’s time for you to sell your old MacBook Pro, want a fresh start to your old machine or just want this damn thing to work again. Wiping and reinstalling macOS is definitely the way to go! Luckily for MacBook Pros, it’s just a simple 3-step process (recovery, wipe, reinstall)!
If your Mac is currently running any version of OS X except El Capitan. If you have a catastrophic hard-drive crash that requires you to initialize (format) or replace your boot drive. If you buy an external hard drive and want it to be capable of being your Mac’s startup disk (that is, a bootable disk).
Reinstall from macOS Recovery
May 14, 2020 Reinstall the Mac OS. The second half of the reformatting process is the reinstallation of the operating system. When you erase your data, you also delete the OS that allows you to use the computer. So, you’ve got to install it again if you want the computer to work. Jul 02, 2020 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.
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).
Option-⌘-R
Upgrade to the latest macOS that is compatible with your Mac. Format thumb drive on mac os x mac.
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.
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.
How To Reinstall Mac Os X
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. What drive format is readable by mac os and windows 10.
Erase Your Hard Drive And Reinstall Mac Os
Other ways to install macOS
Erase Your Hard Drive And Reinstall Mac Os Download
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.