Hands on with Lion Recovery Disk Assis…
https://www.macworld.com/article/213774/hands-on-with-lion-recovery-disk-assistant.html
To use your new emergency disk, follow these steps: Connect your new emergency drive to one of your Mac’s USB ports. Restart (or start up) your Mac while holding down the Option key. Choose a local Wi-Fi network from the pop-up menu and provide the network’s password. Select Recovery HD and then click the upward-pointing arrow below Recovery HD to boot from it. Once you are in macOS Recovery, verify you are connected to WiFi in the top right corner. Go to Disk Utility. Select "View" in the toolbar —> "Show All Devices". Select your main hard drive or SSD. Connect your new emergency drive to one of your Mac’s USB ports. Restart (or start up) your Mac while holding down the Option key. ... Turn on the Mac, (if off) and immediately press and hold Option + Command + R until you see a spinning globe. Once you are in macOS Recovery, verify you are connected to WiFi in the top right corner.
Connect your new emergency drive to one of your Mac’s USB ports.
Restart (or start up) your Mac while holding down the Option key.
Choose a local Wi-Fi network from the pop-up menu and provide the network’s password.
Select Recovery HD and then click the upward-pointing arrow below Recovery HD to boot from it.
Once you are in macOS Recovery, verify you are connected to WiFi in the top right corner.
Go to Disk Utility.
Select "View" in the toolbar —> "Show All Devices".
Select your main hard drive or SSD.
Restart (or start up) your Mac while holding down the Option key. ...
Turn on the Mac, (if off) and immediately press and hold Option + Command + R until you see a spinning globe.
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