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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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SoftRAID 5.7.5 driver troubles with WD30EFRX?
#1
I have a OWC Thunderbay 4 attached to a Mac Mini (Late 2015) with High Sierra that has been working flawlessly for 3 years with 4 WD30EFRX-68EUZN0 drives in RAID 5 configuration. Lats month I got a message that one of the disks was about to fail. So I ordered 2 new WD30EFRX-68EUZN0. I tried both as replacement disk but BOTH immediately failed with the same error "Disk or cable are defective and need to be replaced". I tried on another OWC Thunderbay 4 that is known to be working, same story. I tried the TB4 connected to my iMac and the drives work just fine. I tried the TB4 connected to the same Mini after uninstalling SoftRAID and everything worked fine.

I have to conclude that there is a problem with the SoftRAID driver WITH THOSE WD30EFRX-68EUZN0. Please note that the ones that work fine are WD30EFRX-68EUZN0 manufactured in 2015 while the ones that are having troubles are manufactured in 2018.

Any ideas?

Thank you!
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#2
Did you try disabling SMART on the drives? (either disk tile, or by disabling SMART checks)

Another test is disabling the SMART USB drivers as an independent test.
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