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How to use a SoftRAID startup volume with High Sierra

If you're using High Sierra, and booting up from a SoftRAID volume, you'll need to follow the steps given in this forum post, since the macOS High Sierra Installer does not recognize SoftRAID volumes as valid startup volumes.

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Will This Set-Up Work?
Using Mojave on a new Late 2018 Mini.
Sonnet Echo Express III-D expansion module, Thunderbolt III
Sonnet Tempo SATA Pro 6Gb 4-Port card
G-Tech Drives 4 (12TB 7200 Enterprise class)
Planning RAID 10


I am sure you have a reason for doing this with an Expansion box instead of a simpler Thunderbolt enclosure, but yes it absolutely will work fine.

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