How to Reinstall macOS Catalina from a USB Drive

If you're experiencing issues with your MacBook or want to start fresh, reinstalling macOS Catalina from a USB drive is a great option. Here's a step-by-step guide on how to do it.

Before you begin, make sure that you have a compatible Mac and a USB drive with enough storage space (at least 12GB for macOS Catalina). You'll also need to create a bootable USB installer of macOS Catalina from another Mac or download the installation media from Apple's website.

Option-Command-R: The Latest Compatible Version

When you start up your Mac, press and hold the Option (⌥), Command (⌘), and R keys simultaneously. This will trigger Recovery mode, which may offer the latest compatible version of macOS Catalina for your Mac.

Command-R: The Current Version

If you prefer to install the current version of macOS Catalina that's currently installed on your Mac, press and hold the Command (⌘) and R keys instead. This option will reinstall the same version of macOS Catalina that's already on your Mac.

Starting Up from Recovery Mode

To start up from Recovery mode, follow these steps:

1. Press and release the power button to turn on your Mac.

2. Immediately after releasing the power button, press and hold one of the key combinations mentioned above (Option-Command-R or Command-R).

3. If you're using a Mac with Apple silicon, Recovery will install the current version of the most recently installed macOS.

Selecting Your User Account

After selecting your language and keyboard layout, you'll be prompted to select a user account. Choose the administrator account that you want to reinstall macOS Catalina for.

Reinstalling macOS Catalina

Once you've selected your user account, click on the 'Continue' button. You'll then see an option to reinstall macOS Catalina. Click on it and follow the prompts to complete the installation process.

Tips and Precautions

* Reinstalling macOS Catalina doesn't remove your apps or personal data, so you won't lose any of your important files.

* If you're unable to shut down your Mac, press and hold the power button for up to 10 seconds until it turns off.

* Make sure that you have a backup of your important files before reinstalling macOS Catalina.

By following these steps, you should be able to successfully reinstall macOS Catalina from a USB drive. Remember to create a bootable USB installer and select the correct key combination to ensure a smooth installation process.

Reinstall macos catalina from usb