4/15/2023 0 Comments Install big sur from usb![]() Instead, I have found what appears to be two different procedures. To do that, you should not just run the updater - that will upgrade your running installation (the internal hard drive). (This is, I believe, your only option if you have an M1-based Mac). You might, however, prefer to perform a clean installation to the SSD instead of an upgrade. ![]() The latest versions of Carbon Copy Cloner should be able to do this. Since your Mac is Intel based, you can upgrade the internal hard drive and then make a bootable clone to the SSD. If your Mac has a T2 chip (which according to Apple does not apply to your 2017 iMac), then you must configure it to allow booting off of external media. If you are building an external SSD from an NVMe device, then Thunderbolt will give you much better performance, but it will cost more. SATA tops out at 6 Gbit/s, so just use a USB3 enclosure.
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