I have a RAID 1 (mirrored) volume made of 2 USB external drives which was created on macOS High Sierra and I wanted to check if I can plug these drives into another machine running an earlier version of macOS like Sierra.

Are RAID volumes independent of the Mac OS that created them?

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    AppleRAID has been the same since I can remember so they should be backward compatible. However, I have hardly (if ever) used software based RAID that I couldn't tell you how to migrate from one machine to another. Your best bet is to give it a try. Make sure your data is backed up. – Allan Mar 12 '20 at 5:41

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