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How to Create a Recovery Drive to Rescue Your Failing Mac

Your Mac is failing to boot up properly due to some unknown glitch, so there’s no way to access the operating system or even get your data off the hard drive. A bootable USB drive, which contains a copy of the operating system, can save the day. This will allow you to check your drive for errors, restore a recent Time Machine backup, and if the drive is still physically working reinstall the operating system to give it a fresh start.
First, you will need a USB flash drive or external hard drive formatted as Mac OS Extended, with at least 14GB of available space. You also need a downloaded installer for macOS Big Sur, or a previous version of macOS if you wish to use that instead. The process supports several past macOS versions, including Catalina, Mojave, High Sierra, and El Capitan. ....

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M1 Macs have another hidden boot mode

M1 Macs have another hidden boot mode
However sparse Apple’s documentation might have become, when it does explain things properly, it’s amazing what’s revealed in the detail. One document every serious Mac user should read and refer to repeatedly is the Platform Security Guide, which Apple has just revised to give all the gory details of how M1 Macs start up. In the course of doing that, it reveals that these new models have a boot mode which doesn’t appear to be documented anywhere else, but which could prove a Mac-saver: Fallback Recovery OS.
If you need your M1 Mac to enter 1 True Recovery (1TR), Recovery Mode, but that fails, there’s a second copy of the software required for 1TR “for resiliency”. To boot into that, instead of just holding the Power button until 1TR starts loading, you should “double-press and hold the power button”, according to the guide. ....

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