it took me a few hours to figure out the new subtleties.
new computers from Apple with a built-in T2 chip (i.e. new iMac Pro and Macbook Pro 2018 edition) have a dedicated operating system protection.
what’s the problem? first of all, by default, they can not be booted from an external medium. it’s part of the security that Apple introduced to make it more difficult for a potential hacker.
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