Using Bootable Recovery Media, you can manage System Integrity Protection and perform operations that cannot be executed from OS X loaded from Macintosh HD partition. See this article for details.
Starting from Big Sur+, RMB omitted due to Apple restrictions: only Signed (macOS installation) Media can be created. Steps below are valid only on older macOS (Catalina and below).
In menu bar, go to Wizards – Create Bootable Recovery Media.
Select the disk device you wish to use and click on Create Bootable Media.
To confirm your decision, click on Erase.
Wait until the process is completed.
Congratulations, you have successfully created Recovery Media.
To boot from Recovery Media, Restart your Mac now. Then hold [Option/Alt] key during computer boot (before Apple logo appears). Using directional buttons, select HDM Recovery and hit Enter. See this article for details.
Hard Disk Manager for Mac, HowTos, Products for Mac OS X
Tags: boot, Festplatten Manager, Festplatten Manager für Mac, Hard Disk Manager, mac, recovery media
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