Booting from another drive mac

Use Startup Manager

Use this feature to make sure that your Mac starts up only from a legitimate, trusted operating system. Learn more about Secure Boot. Use this feature to control whether your Mac can start up from an external hard drive, thumb drive, or other external media. To open Startup Security Utility: When you're asked to authenticate, click Enter macOS Password, then choose an administrator account and enter its password. Firmware password protection Use a firmware password to prevent anyone who doesn't have the password from starting up from a disk other than your designated startup disk.

Permanently set startup disk at boot time

Secure Boot Use this feature to make sure that your Mac starts up only from a legitimate, trusted operating system. So far everything is working, not sure what happened but now I am going to have a main boot drive along side an external boot drive. Even a Mac can have a bad hair day! I installed a new gb hard drive today and reinstalling mac OS X from an external drive. The first time I got a circle with a diagonal line through it on the screen, after I saw the apple, and the spinner was spinning below the circle.

What’s a startup disk?

What is the solution to get past this? Take your HD out and install it into a inclosure box. Then connect it to your usb connector on your made and restart computer. If your computer starts and boots.

Permanently set startup disk at boot time | Macworld

Then its your HD wire. Need to replace it. I was getting a folder with a question mark so replaced my hd with a ssd hd. Any suggestions? Can i use an external hard drive to boot up my Macbook daily? Does switching between the internal macintohs and the external hard drive back and forth faily damage my Macbook in any ways be it software or hardware?

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All Rights Reserved. Reproduction without explicit permission is prohibited. Enter your email address below: Posted by: Kevin says: November 25, at 4: Dimitri says: November 30, at 5: Glenn says: January 5, at Brian says: Select your startup disk, then restart your Mac. Press and hold the Option key immediately after turning on or restarting your Mac.

If your Mac is protected by a firmware password , you can release the key when you're asked to enter the password. Select your startup disk, then click the arrow under its icon, or press Return.

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If you press and hold the Control key during this step, your selection is saved in Startup Disk preferences, so it persists until you change it. If you can't select your startup disk or start up from it Check for these possibilities if you can't see your disk in Startup Disk preferences or Startup Manager, or your Mac won't start up from it.


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Open the Terminal app, which is in the Utilities folder of your Applications folder. If you want to remove this additional protection but keep your firmware password: Type this command, then press Return: Type the administrator password for your user account, then press Return.


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  4. Type your firmware password, then press Return.