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Your macOS installation is corrupted and you want to boot from an external Thunderbolt hard drive to repair the installation. Which key(s) do you hold down at startup to boot from the external hard drive?
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Your macOS installation is corrupted and you want to boot from an external Thunderbolt hard drive to repair the installation. Which key(s) do you hold down at startup to boot from the external hard drive?

User Hienz
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1 Answer

6 votes

Answer:

The Alternate (Alt) key

Step-by-step explanation:

Press down the Option (Alt) key, soon after turning on the mac.

User Nzc
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