I have a 5,1 Mac Pro High Sierra 10.13.6 that won't boot. I suspect a hard disk problem. I want to make an external 10.13.6 system boot disk , but the only other Mac available to me is an M2 Macbook Air running Sequoia. How to make an external 10.13.6 system boot disk on it? Is this possible?
Mac Pro, macOS 10.13
In short - Not from the M2 Macbook Air running Sequoia
To perform this action will require booting from a Bootable Installer.
The Bootable Installer can Only be performed on an Apple Computer
This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer.
Example : Bootable Installer of High Sierra would have to be done on a computer that Qualifies to run High Sierra
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’t be used.
Alternative is, to gain access to a Qualifying Apple Computer from a family member, friend or associate.
In short - Not from the M2 Macbook Air running Sequoia
To perform this action will require booting from a Bootable Installer.
The Bootable Installer can Only be performed on an Apple Computer
This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer.
Example : Bootable Installer of High Sierra would have to be done on a computer that Qualifies to run High Sierra
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’t be used.
Alternative is, to gain access to a Qualifying Apple Computer from a family member, friend or associate.
Boot that old Mac to Internet Recovery with the workaround below (I wish Apple finally fixes that very old flaw), and install High Sierra to an external disk (format a HDD as MacOS Extended, GUID, or a SSD as APFS).
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Making an external system boot disk for an old Mac, on a new Mac.
