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Booting macOS on Apple silicon: Multiple boot disks

T T Read More

How Apple silicon Macs create LocalPolicy to allow another boot volume group to be used, the problems that can occur, and how to investigate them.

November 22, 2022 Macs, Technology

Booting macOS on Apple silicon: LocalPolicy

To understand what might go wrong when trying to boot an Apple silicon Mac from an external disk, start with LocalPolicy: what it is, and how it works.

November 21, 2022 Macs, Technology

Last Week on My Mac: Some boot, but others don’t

Why can some with Apple silicon Macs create and boot from external disks, while others seem doomed to failure?

November 20, 2022 Macs, Technology

Last Week on My Mac: The slim hope of recovery

Monterey changes the way that Recovery works on M1 Macs, making them more like Intel Macs by using a paired Recovery volume. But that could spell trouble.

May 15, 2022 Macs, Technology

Explainer: what makes a volume bootable?

One command, bless, used to do it all, copying boot.efi to the right place and declaring the volume bootable in its header. Where are we with Big Sur and M1 Macs?

June 5, 2021 Macs, Technology

M1 Secure Boot, morphine and self-destruction

One command in Terminal which instantly disables any support, and why you can’t (yet) boot your M1 Mac in Linux.

May 21, 2021 Macs, Technology

How to boot an M1 Mac into an older version of Big Sur

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How changing a volume’s boot policy can let you boot in older macOS, and update, if you wish. For anyone who uses external bootable disks with an M1 Mac.

May 11, 2021 Macs, Technology

M1 Macs radically change boot and recovery

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Unlike Intel Macs, M1 models always start booting from internal SSD, and can only offer full Recovery from there too. This has benefits, and some drawbacks too.

January 14, 2021 Macs, Technology
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