Before you begin, ensure you have downloaded the macOS installer from the App Store and have a USB drive with at least 16GB of space. This process effectively turns the USB stick into a bootable system disk that mimics the Recovery Partition.
macOS Recovery Partition精简 Version 教程：创建可启动安装器
Creating a Bootable Installer for Advanced Needs The Utility for Startup Disk Management While downloading from the App Store is sufficient for most users, specific scenarios require a bootable installer. In these cases, you must create a bootable installer using a separate Mac and a formatted USB drive with sufficient storage space.
To initiate the download, simply open the App Store application, navigate to the "Updates" tab, and look for the latest version of macOS listed there. The creation process relies on the Terminal application, which allows you to use specific commands to build the installer.
macOS Recovery Partition精简 Version 教程
Official Recovery Options Without Installation Media If your goal is simply to reinstall the current operating system without creating external media, you can utilize the built-in Recovery System. This method provides a failsafe way to install the operating system without relying on the potentially damaged state of the internal drive.
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