What does it take to install a recent version of an older macOS on an external disk, in Golden Gate? Something of an epic journey through the past, resulting in disappointment and frustration.
external drive
Do you want to install an older version of macOS on an Apple silicon Mac running a more recent version? You may have problems achieving this in Golden Gate 27.2, but here are the full instructions in detail.
How to ensure the external disk has you as its Owner, with a LocalPolicy that allows your Mac to use it as a boot disk. When yo avoid using a DFU port, and negotiating keychain problems.
You’re in a rush, and need to disconnect your MacBook Pro’s external drive. But when you try to eject it, one or more programs may be using it. What do you do next?
One Thunderbolt port is the designated DFU port, to be used when connecting via USB-C in DFU mode, and to be avoided for external bootable disks. But how can you identify it?
Apple silicon Macs were designed to boot almost as securely from external disks as from their internal SSD. That makes macOS installation a little more complicated. Here’s how to do that.
Systematic and thorough account of the structure and function of bootable external disks and dual-boot systems from High Sierra to Sequoia, and how to diagnose their problems.
You could save hundreds of $/€/£ buying a Mac with a smaller internal SSD. Is that a good economy, or will you come to regret it? Here are the pros and cons.
It took over 6 months before creating bootable external disks was fairly reliable, and even then there were unexplained failures. Did someone fail to tell us something?
Two important catches that can cause a macOS installation to fail in Apple silicon: using the DFU port, and not setting up ownership correctly. Both are explained here.
