When creating a bootable macOS USB installation disk, you need to pay attention to the following steps: 1. Prepare a USB drive of at least 16GB (USB 3.0 or update recommended), a computer running macOS, and a macOS installer downloaded from the App Store; 2. Use "Disk Tool" to format the USB drive as "Mac OS Extension (Login)" and set the partition plan to "GUID Partition Diagram"; 3. Run commands through the terminal to write the macOS installer to the USB drive, pay attention to replacing the system name and USB drive name in the command; 4. After the production is completed, press and hold the Option key (Intel) or long press the power key (M1/M2) when booting on the target Mac to enter the boot management interface, and select USB drive to boot to test or install.
Creating a bootable macOS USB installation disk is not too difficult, but there are several key points to pay attention to. If this is your first operation, you may be confused by the command line or format selection. Below I will explain it step by step from preparing the tools to the specific steps so that you can complete the production smoothly.

Prepare the required materials
To create a boot disk for macOS, you must first prepare the following things:

- A USB drive with a capacity of at least 16GB (USB 3.0 or newer standards are recommended)
- A computer running macOS (you can also do it in a black apple or virtual machine, but requires additional configuration)
- The corresponding version of macOS installer (can be downloaded from the App Store)
The USB drive does not have to be large, but it must be stable and reliable. A poor-quality USB drive may cause write failures or errors during installation. It is recommended to use brand products, such as SanDisk and Samsung.
Format the USB drive to the correct format
After inserting the USB flash drive, open "Applications" → "Disk Utility" in "Utilities". Find your USB device on the left, click it, and do the following:

- Click "Erase"
- You can get the name as you like, such as "macOS Installer"
- Select "Mac OS Extension (Log)" in the format
- Select "GUID Partition Map" for the plan
This step is very critical. If the partition table is not a GUID, the subsequent production may not be successful. Many people have problems at this step, but they cannot see the installation disk when booting.
Use terminal commands to write installation files
Next is the most critical step: write the macOS installer to the USB drive. This process requires terminal commands.
- Open the Terminal app
- Enter the command template (note that you replace the name in it):
sudo /Applications/Install\ macOS\ [System Name].app/Contents/Resources/createinstallmedia --volume /Volumes/[U disk name]
For example, if you are installing macOS Ventura, the USB drive is called "macOS Installer", the command will be:
sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/macOS\ Installer
- Enter the password after entering the carriage (it will not be displayed), confirm that it starts writing
This process lasts about ten minutes, do not unplug the USB flash drive during this period. Once you're done, your boot disk is ready.
Test and use the boot disk
Plug back on the target Mac, hold down the Option key (Intel Mac) when powering on or connect the power supply and press the power key (Apple Silicon M1/M2 and other chips) to enter the boot management interface. You should see your USB flash drive appear in the options.
At this time, you can choose to boot from the USB flash drive and enter the installation interface. If you just want to test whether it is successful, you don't have to install it immediately.
Basically all that is it. The whole process looks a bit technical, but as long as you follow the steps, there will be basically no problem. The key point is the partition format and command accuracy, just don't miss any details.
The above is the detailed content of How to create a bootable macOS USB installer. For more information, please follow other related articles on the PHP Chinese website!

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