![]() The Mac should recognize that there’s no macOS Recovery partition installed, show a spinning globe. Start up your Mac from a shut down state or restart it, then immediately hold down Command-R. Macs can reach out over the internet and bootstrap themselves back into operation, as the Mac firmware-software built into a Mac that’s persistent and isn’t dependent on the operating system being installed-knows how to connect to the internet and reach Apple’s servers. But what happens if you erase the entire drive, including this hidden partition? ![]() MacOS Recovery occupies a small, invisible partition on your startup drive, and lives quietly there until you need it. You may know this tool, introduced way back in Mac OS X 10.7 Lion, as a way to start up your computer to run Disk Utility without having your startup drive mounted, to reinstall macOS, and for a number of other technical purposes. It happens! (In the spirit of confession, I managed to delete the core operating system off my first Unix system in 1994, because I thought, “This file takes up too much space!”)įortunately, Apple has you covered with macOS Recovery. Mac 911 is a place you can come with no judgement, even if you managed to erase your Mac’s startup disk and you’re not sure what to do next.
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