Mac Boot Camp Choose Startup
Available only on Mac computers that have the Apple T2 Security Chip, Secure Boot offers three settings to make sure that your Mac always starts up from a legitimate, trusted Mac operating system or Microsoft Windows operating system: Full Security, Medium Security, and No Security.
Dec 10, 2019 Open Boot Camp Assistant, which is in the Utilities folder of your Applications folder. Then follow the onscreen instructions. If you're asked to insert a USB drive, plug your USB flash drive into your Mac. Boot Camp Assistant will use it to create a bootable USB drive for Windows installation. Dec 10, 2019 When Boot Camp Assistant finishes, your Mac restarts to the Windows installer. If the installer asks where to install Windows, select the BOOTCAMP partition and click Format. In most cases, the installer selects and formats the BOOTCAMP partition automatically.
Secure Boot settings are available in Startup Security Utility:
You can select which operating system to use during startup by holding down the Option key. This displays icons for all available startup disks and lets you override the default setting for the startup disk that is in Startup Disk preferences (OS X) or the Boot Camp. In Windows on your Mac, click in the right side of the taskbar, click the Boot Camp icon, then choose Boot Camp Control Panel. If a User Account Control dialog appears, click Yes. Select the startup disk that has the default operating system you want to use. If you want to start up using the default operating system now, click Restart. Press and hold the Option key during startup, then choose your Windows or macOS startup disk. After installing Microsoft Windows on your Mac with Boot Camp, use Startup Manager to switch between Windows and macOS. Restart your Mac, then immediately press and hold the Option (or Alt) ⌥ key on your keyboard during startup.
- Turn on your Mac, then press and hold Command (⌘)-R immediately after you see the Apple logo to start up from macOS Recovery.
- When you see the macOS Utilities window, choose Utilities > Startup Security Utility from the menu bar.
- When you're asked to authenticate, click Enter macOS Password, then choose an administrator account and enter its password.
Full Security
Full Security is the default Secure Boot setting, offering the highest level of security. This is a level of security previously available only on iOS devices.
During startup, your Mac verifies the integrity of the operating system (OS) on your startup disk to make sure that it's legitimate. If the OS is unknown or can't be verified as legitimate, your Mac connects to Apple to download the updated integrity information it needs to verify the OS. This information is unique to your Mac, and it ensures that your Mac starts up from an OS that is trusted by Apple.
If FileVault is enabled while your Mac is attempting to download updated integrity information, you're asked to enter a password to unlock the disk. Enter your administrator password, then click Unlock to complete the download.
If the OS doesn't pass verification:
- macOS: An alert informs you that a software update is required to use this startup disk. Click Update to open the macOS installer, which you can use to reinstall macOS on the startup disk. Or click Startup Disk and choose a different startup disk, which your Mac will also attempt to verify.
- Windows: An alert informs you that you need to install windows with Boot Camp Assistant.
If your Mac can't connect to the Internet, it displays an alert that an Internet connection is required.
- Check your Internet connection, such as by choosing an active network from Wi-Fi status menu in the menu bar. Then click Try Again.
- Or click Startup Disk and choose a different startup disk.
- Or use Startup Security Utility to lower the security level to Medium Security.
Medium Security
During startup when Medium Security is turned on, your Mac verifies the OS on your startup disk only by making sure that it has been properly signed by Apple (macOS) or Microsoft (Windows). This doesn't require an Internet connection or updated integrity information from Apple, so it doesn't prevent your Mac from using an OS that is no longer trusted by Apple.
If the OS doesn't pass verification:
- macOS: An alert informs you that a software update is required to use this startup disk. Click Update to open the macOS installer, which you can use to reinstall macOS on the startup disk. This requires an Internet connection. Or click Startup Disk and choose a different startup disk, which your Mac will also attempt to verify.
- Windows: An alert informs you that you need to install windows with Boot Camp Assistant.
No Security
Mac Choose Boot Device
The No Security setting doesn't enforce any of the above security requirements for your startup disk.