How to install new macos from usb

Installing macOS from a USB drive is a great way to perform a clean installation or upgrade your Mac without using the internet. Here's a step-by-step guide to help you install macOS from a USB drive:

Requirements:

• A compatible Mac computer (check the macOS compatibility list)
• A USB drive with at least 16GB of free space (32GB or more recommended)
• A valid macOS installation media (e.g., a USB drive or a bootable DVD)
• A compatible USB drive formatting tool (e.g., Disk Utility or a third-party tool like Etcher)

Step 1: Prepare the USB Drive

1. Connect the USB drive to your Mac.
2. Open Disk Utility (located in Applications/Utilities or use Spotlight to search for it).
3. Select the USB drive from the list of devices on the left side of the window.
4. Click the "Erase" button and select "Quick Erase" or "Security Erase" (depending on your preference).
5. Format the USB drive as a single partition with the following settings:
   • Volume Format: Mac OS Extended (Journaled)
   • Scheme: GUID Partition Map
6. Click "Erase" to format the USB drive.

Step 2: Download the macOS Installation Media

1. Go to the Apple Support website and download the macOS installation media (e.g., macOS High Sierra or later).
2. Once the download is complete, open the.dmg file and follow the prompts to create a bootable USB drive.

Step 3: Create a Bootable USB Drive

1. Open the Terminal app (located in Applications/Utilities or use Spotlight to search for it).
2. Type the following command and press Enter:

   sudo /Applications/Install\ macOS\ [version].app/Contents/Resources/createinstallmedia --volume /Volumes/USB\ Drive --applicationpath /Applications/Install\ macOS\ [version].app

   Replace [version] with the version of macOS you're installing (e.g., High Sierra, Mojave, etc.).

Step 4: Boot from the USB Drive

1. Restart your Mac and immediately hold down the 'Option' (⌥) key.
2. Release the 'Option' key when you see the boot menu.
3. Select the USB drive as the boot device.

Step 5: Install macOS

1. Follow the on-screen instructions to install macOS.
2. Select the language and keyboard layout, then click "Continue".
3. Agree to the terms and conditions, then click "Agree".
4. Select the installation method: "Erase" or "Upgrade" (depending on your preference).
5. Follow the installation process, which may take several minutes.

Step 6: Set Up Your Mac

1. Once the installation is complete, you'll be prompted to set up your Mac.
2. Follow the on-screen instructions to create a user account, set up your network, and configure other settings.

That's it! You should now have a fresh installation of macOS on your Mac.