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external thunderbolt drive

  1. Flaming Gerbil

    Problem booting from external Thunderbolt drive

    First time trying this with my M1 Macbook Air (256GB internal too full). Went through the install process successfully. Booted off the external no problem. Used all day, then shut down. Next morning, MB would not start off the external, but brought me to the boot drive selection screen. I...
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