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<blockquote data-quote="Lifeisabeach" data-source="post: 1882957" data-attributes="member: 38864">So I've spent some considerable time trying to get my external SSD to boot Big Sur on my M1 MBA and nothing works. I've tried wiping the drive from scratch, then installing Big Sur clean. That install process actually prompted me to select an admin user off the internal volume and optionally transfer settings over. Despite doing that, no dice. I couldn't boot off of it, nor adjust the Startup Security Utility's settings to allow it. After this, I cloned over the Data volume using CCC, and again, no dice. This despite using a USB 3.1 enclosure with first a USB-C cable, then a Thunderbolt cable.So from all appearances, it appears that you do indeed need a native Firewire drive to be able to boot an Apple Silicon Mac externally. I'm a little baffled as to why Macworld says a native 3.1 or 3.2 drive is required while also saying native Thunderbolt. They aren't the same. For reference, <a href="https://icybox.de/en/product.php?id=160" target="_blank">this is the enclosure I use</a>. It's a 3.1 enclosure with USB-C.</blockquote>

[QUOTE="Lifeisabeach, post: 1882957, member: 38864"] So I've spent some considerable time trying to get my external SSD to boot Big Sur on my M1 MBA and nothing works. I've tried wiping the drive from scratch, then installing Big Sur clean. That install process actually prompted me to select an admin user off the internal volume and optionally transfer settings over. Despite doing that, no dice. I couldn't boot off of it, nor adjust the Startup Security Utility's settings to allow it. After this, I cloned over the Data volume using CCC, and again, no dice. This despite using a USB 3.1 enclosure with first a USB-C cable, then a Thunderbolt cable. So from all appearances, it appears that you do indeed need a native Firewire drive to be able to boot an Apple Silicon Mac externally. I'm a little baffled as to why Macworld says a native 3.1 or 3.2 drive is required while also saying native Thunderbolt. They aren't the same. For reference, [URL='https://icybox.de/en/product.php?id=160']this is the enclosure I use[/URL]. It's a 3.1 enclosure with USB-C. [/QUOTE]

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