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Startup Disk

I am trying to setup a startup disk on my Mac Air (macOS Monterey) for my MacBook Pro (Catalina) that has a problem with its screen going black. Am I able to do this??


Posted on May 2, 2022 11:10 AM

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Posted on May 2, 2022 1:44 PM

To perform this action will require booting from a Bootable Installer


This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer.


Only as Example : Bootable Installer of Big Sur would have to be done on a computer that Qualifies to run Big Sur.


Notation: If the computer being used to perform this action is Too New or Too Old to qualify to run the version of macOS - this computer can not be used.


The only alternative is to get access to an Apple Computer that qualifies to run the version of macOS one whats to put on the USB Installer Drive

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Question marked as Top-ranking reply

May 2, 2022 1:44 PM in response to Tjentertainment

To perform this action will require booting from a Bootable Installer


This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer.


Only as Example : Bootable Installer of Big Sur would have to be done on a computer that Qualifies to run Big Sur.


Notation: If the computer being used to perform this action is Too New or Too Old to qualify to run the version of macOS - this computer can not be used.


The only alternative is to get access to an Apple Computer that qualifies to run the version of macOS one whats to put on the USB Installer Drive

May 2, 2022 11:41 AM in response to Tjentertainment

if your mac is compatible with monterey, then yes it can be done. but there is a catch. when installing monterey, there is a required firmware update for the mac that checks for an OEM Apple SSD / HDD. to be able to install monterey on the external SSD, it appears as though the host computer must first be upgraded to monterey BEFORE you install monterey on the external drive.


also, there have been reports of some users attempting to upgrade from catalina directly to monterey running into issues with the install. i would highly recommend first upgrading to big sur, and then on to monterey.


once those conditions have been met, you can read this well written and very informative user tip to install monterey onto the external drive: How to Setup and Use an External SSD as your Startup Disk - User Tip

Startup Disk

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