You can make a difference in the Apple Support Community!
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
I'm trying to make an external SSD that can boot my MacBook, using Big Sur. I formatted the SSD as APFS. I downloaded the app Install macOS Big Sur. The app installed Big Sur on the external SSD. I then change the Startup Disk to the external SSD. When I click "Restart" I get this error:
I tried all this twice and got the same error message. What's wrong?
MacBook Pro 15″, macOS 11.6
are you trying to create a bootable installer? if yes, please see this article: How to create a bootable installer for macOS – Apple Support
or are you trying to set up an independent start up drive? if yes, please see this informative, well written user tip: How to Setup and Use an External SSD as your Startup Disk - User Tip
are you trying to create a bootable installer? if yes, please see this article: How to create a bootable installer for macOS – Apple Support
or are you trying to set up an independent start up drive? if yes, please see this informative, well written user tip: How to Setup and Use an External SSD as your Startup Disk - User Tip
Hello Thomas Kehoe,
Looking over the Apple Support article How to create a bootable installer for macOS - Apple Support, I believe you have the SSD formatted incorrectly.
“What you need to create a bootable installer
I hope this helps.
Search Apple Support of Secure Enclave or Secure Boot . Applies only to Apple computers with the T2 Chip
How do I make a bootable startup external SSD? SDErrorDomain error 104.
