![]() Or you can click the Apple icon and select About This Mac > More Info… Hold the Option key and choose Apple menu > System information. Plug in your external thumb drive to your MacBook/MacBook Pro/iMac. Check whether your external drive can be functioned as a startup disk: This step is necessary only when your USB device not using a GUID partition map. Step 1: Check and Format USB Drive to Be Bootable on Mac
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