![]() Select Recovery HD from the Startup Manager.įor detailed information on this update, please visit: About OS X Recovery Disk Assistant. To access OS X Recovery, reboot the computer while holding the Option key. When the OS X Recovery Disk Assistant completes, the new partition will not be visible in the Finder or Disk Utility. Insert an external drive, launch the OS X Recovery Disk Assistant, select the drive where you would like to install, and follow the on screen instructions. To create an external OS X Recovery, download the OS X Recovery Disk Assistant application. Note: In order to create an external OS X Recovery using the OS X Recovery Assistant, the Mac must have an existing Recovery HD. The OS X Recovery Disk Assistant lets you create OS X Recovery on an external drive that has all of the same capabilities as the built-in OS X Recovery: reinstall Lion or Mountain Lion, repair the disk using Disk Utility, restore from a Time Machine backup, or browse the web with Safari. Once you hit Enter, you'll need to enter your admin password to approve the command, and then hit "Y" on your keyboard to confirm that you're OK with the contents of the USB drive being overwritten.Built right into OS X, OS X Recovery lets you repair disks or reinstall OS X without the need for a physical disc. Here's another example that creates a macOS High Sierra install USB on a drive named "MacOS Installer": sudo /Applications/ Install\ macOS\ High\ Sierra.app/ Contents/Resources/createinstallmedia -volume /Volumes/MacOS\ InstallerĬommand to list all connected volumes, which will include your USB installation medium in case you need to check the label. For example, "Install macOS High Sierra.app" would become Install\ macOS\ High\ Sierra.app Be aware that any spaces will need to be preceded by a backslash. You can change various parts of this command to suit your own circumstances, with the main one being the name of the installer. This assumes that you're installing Big Sur, that your drive is labeled "macos_installer," and that you have the relevant macOS installer in your Applications folder: sudo /Applications/ Install\ macOS\ Big\ Sur.app/ Contents/Resources/createinstallmedia -volume /Volumes/macos_installer You can use a single command to create your installation medium, but this differs depending on which version of macOS you're trying to install. We'll be using Terminal to create the USB drive, so launch it via Spotlight or locate the app in your Applications > Utilities folder. We'd recommend test-driving any experimental macOS installations for a while before you commit. As a last resort, you could manually back up your important documents, libraries, and so on to an external drive. ![]() You can get around this by using a third-party backup tool like Carbon Copy Cloner or ChronoSync. For example, trying to restore a Time Machine backup made in Big Sur (released in 2020) in macOS Catalina (released in 2019) could prove difficult. 202 17K views 1 year ago How to Create USB Bootable Mac OS X Mountain Lion on Windows 10 In this video, I will show you how to create a bootable USB Mac OS X Mountain Lion o Show more. Older versions of macOS might experience problems restoring from Time Machine backups made on subsequent releases. If you do decide to try a new version of macOS and you're reliant on Time Machine for your backups, resist backing up with Time Machine until you're sure that it's where you want to stay. This guide can help you roll back to almost any version of macOS. After trying this, you might come to the conclusion that newer releases perform too poorly on your hardware, at which point, you'll need to roll back. If you're willing, you can install newer versions of macOS than your Mac supports with tools like Patched Sur.
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