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Secure Boot

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

Did someone forget their password? Getting access to a locked Mac

Maybe you’ve just forgotten the password, or perhaps the owner/user of the Mac is no longer able to enter it. How to restore access to different models.

January 18, 2022 Macs, Technology

Last Week on My Mac: Maintaining macOS has changed

in Mac OS 8 and 9, you could patch the system direct. OS X was harder, and became sprawling and interdependent, encouraging users to reinstall macOS. That has now ended with the introduction of the SSV.

December 26, 2021 Macs, Technology

When you can’t restart an M1 Mac from an external disk

Assigning ownership to an external bootable disk doesn’t always work in Recovery mode on an M1 Mac. But there’s an easy workaround.

December 17, 2021 Macs, Technology

Using an M1 Mac: some basic principles

M1 Macs are different, as they always start booting from their internal SSD. Basic configurations are simple, reliable with well-established disaster recovery methods.

November 9, 2021 Macs, Technology

Explainer: xART and nonces

A strange volume named xART or xarts, secure memory management, and long random numbers: how they fit together to protect against replay attacks.

July 3, 2021 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

Last Week on My Mac: How it took 6 months for M1 Macs to work properly

T T Read More

Soon after Apple started delivering M1 Macs, users found that they couldn’t boot them from external disks. Six months later, this has largely been fixed. What went wrong?

May 30, 2021 Macs, Technology

M1 Macs running Big Sur 11.4 support external disks fully

T T Read More

macOS 11.4 has finally fixed all the problems with installing current and older macOS on external disks, and booting an M1 Mac from them.

May 27, 2021 Macs, Technology

Big Sur 11.4 brings LocalPolicy and recovery access to M1 Macs

What are a new kernel extension and a private framework doing in macOS 11.4? Here are some details, and suggestions for further research.

May 26, 2021 Macs, Technology

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