In these cases, you must create a bootable installer using a separate Mac and a formatted USB drive with sufficient storage space. This is particularly useful if the Mac cannot start up normally, if you are setting up multiple machines, or if you need to erase the startup disk before installation.
Creating a Bootable macOS Installer USB Drive
Verify that you have sufficient free storage space on the startup disk, as the installer files require several gigabytes of room. By using the App Store, you guarantee that you are receiving a legitimate, unmodified copy of the operating system that has been verified by Apple.
This grants access to the installation utilities even when the main operating system is inaccessible. Upon restarting the target Mac, you can hold the power button or specific key combinations to select the USB drive as the startup device.
Create a Bootable macOS Installer USB Drive for Safe Installation
This process effectively turns the USB stick into a bootable system disk that mimics the Recovery Partition. 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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