![]() If you need to reinstall the operating system from scratch and the Recovery partition is missing, or for some reason you can’t access it, it’s a problem, but luckily there are solutions available. We look in detail at what you can do in Recovery mode in a separate article. But there are actually four separate sections, and one is used in extreme cases where you may want to completely reinstall the operating system macOS (previously known as Mac OS X).Įven if you completely wipe your Mac, and start again from scratch, the Recovery partition should still be there to make it possible to reinstall macOS, restore from your Time Machine backup, and repair or erase your hard disk. You’re used to only seeing one room in the house, the one which has your Desktop, Folders and Applications. (Read: How to partition a Mac hard drive or SSD, or create a APFS volume for more information.) ![]() ![]() Think of your hard drive as the house, and the volumes as different rooms. A hard drive is typically a single volume, but it is then split up into multiple areas, known as partitions or volumes. They just see the whole drive as one thing. You can now quit Terminal and eject the volume.Most people don’t really think about their hard drives (well, SSD these days) in terms of partitions. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Sonoma.After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume.Terminal shows the progress as the volume is erased. When prompted, type Y to confirm that you want to erase the volume, then press Return.Terminal doesn't show any characters as you type. When prompted, type your administrator password.If the volume has a different name, replace MyVolume in the command with the name of your volume. Each command assumes that the installer is in your Applications folder, and that MyVolume is the name of the USB flash drive or other volume that you're using. Type or paste one of the commands below into Terminal, then press Return to enter the command. ![]()
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