Security Settings Do Not Allow This Mac to Use an External Startup Disk: How to Fix?

Encountering the frustrating "Security settings do not allow this Mac to use an external startup disk" error message while attempting to boot from an external drive? This guide explains the error, its causes, and how to resolve it.

The error arises when macOS security settings block booting from an external drive. This only occurs during startup attempts from an external source. If you're experiencing issues with external drives not appearing, refer to separate troubleshooting guides.

Why This Happens:

Apple's robust macOS security features, often enhanced by the T2 Security Chip or Apple Silicon chip in newer Macs, prioritize booting from verified operating systems to prevent malware or corrupted disks. This default setting in Startup Security Utility restricts booting from external drives.

The Solution:

While MacKeeper's Premium Services offers personalized assistance, you can resolve this yourself by adjusting security settings within Recovery Mode. First, determine your Mac's chip type:

1. Check Chip Type: Go to Apple menu > About This Mac. "Chip" indicates Apple Silicon; "Processor" indicates Intel.

2. Enter Recovery Mode:

   • Apple Silicon: Shut down your Mac. Press and hold the Power button until you see "Options" and your system volume. Click "Options" and "Continue." Authenticate with your administrator account and password.
   • Intel Processor: Turn on or restart your Mac, immediately pressing and holding Command R. Enter your password if prompted. Select your hard drive and choose "Next." You may need to enter your administrator credentials.

3. Access Startup Security Utility: Once in Recovery Mode (macOS Utilities), navigate to Utilities > Startup Security Utility.

4. Enable External Booting: Authenticate with your password. Enable "Allow Booting from External or Removable Media."

5. Restart: Restart your Mac.

After restarting, your Mac should allow booting from the external drive. If you require further assistance, consider MacKeeper's Premium Services.

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