It won't do harm to your personal files. It's likely that the bootdisk can't recognize your hard drive. Thank you! Did you make this project? Share it with us! I Made It! It is now safe to remove the drive from the Mac. Before proceeding, ensure there are adequate backups available for the Mac you are about to upgrade before the process starts.
With the target Mac you want to upgrade turned off , connect your external drive. When turning on the Mac, hold down the Option key on the connected keyboard to bring up the Startup Manager. The Startup Manager is used to boot from a different drive from the default. In this case, select "Install macOS Catalina. The Mac will then bring up a macOS Utilities window. To perform a straight update, select "Install macOS" and follow the prompts. The macOS Utilities menu also allows you to erase the Mac's drive, which you can optionally do if you do not wish to save any of the data and want a completely clean slate for the installation.
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This site uses Akismet to reduce spam. Learn how your comment data is processed. Take a pen drive. Mount it to your computer or laptop Download the ISO of the operating system you want to install.
Install any of the below-given Pen drive bootable creators. Then simply restart the system to start the booting for OS installation. Contents show. Rufus- Open source USB bootable creator. Open Terminal, which is in the Utilities folder of your Applications folder.
Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using.
If it has a different name, replace MyVolume in these commands with the name of your volume. After typing the command: Press Return to enter the command. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased. After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume.
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