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jpski31 Author

Level 1

4 points

How can I get ssd external hd to boot on iMac OS Monterey

Posted on Mar 10, 2023 4:56 PM

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HWTech

Level 9

60,248 points

Posted on Mar 12, 2023 12:42 PM

If you are using a 2018+ Mac, then you need to modify the computer's security settings to allow booting from external media by using the Startup Security Utility:

About Startup Security Utility on a Mac with the Apple T2 Security Chip - Apple Support

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Top-ranking reply

HWTech

Level 9

60,248 points

Mar 12, 2023 12:42 PM in response to jpski31

If you are using a 2018+ Mac, then you need to modify the computer's security settings to allow booting from external media by using the Startup Security Utility:

About Startup Security Utility on a Mac with the Apple T2 Security Chip - Apple Support

a brody

Level 10

83,987 points

Mar 10, 2023 6:07 PM in response to jpski31

Make sure it is formatted APFS with disk utility before you clone backup the data with Carbon Copy Cloner or Shirt Pocket Superduper, or run the installer of the operating system on the external drive itself.

How can I get ssd external hd to boot on iMac OS Monterey