Volume does not mount in High Sierra (10.13.x) after updating the driver

Note: This FAQ applies to macOS High Sierra (10.13.x) only and is provided for legacy reference.

Diagnosis

Run SoftRAID and look in the expanded volume tile for “Disk Identifier.” It should display a disk number, such as disk5. If this field shows “-” instead of a number, the SoftRAID driver is not loading.

Why this happens

High Sierra is blocking the SoftRAID driver from loading. This occurs because a limited version of the SoftRAID driver is bundled with macOS, and OWC needed to change the Developer ID used with Apple to “notarize” applications in order to merge different accounts into a single Developer ID. High Sierra does not automatically accept the updated driver under the new Developer ID.

Solution

Temporarily disable SIP (System Integrity Protection), reinstall the SoftRAID driver, then re-enable SIP. This works 100% of the time on 10.13.

Steps:

• Restart into Recovery Mode by holding Command-R at startup
• Open Terminal and enter: csrutil disable
• Enter reboot or restart from the Apple menu
• After your system restarts, launch SoftRAID
• Click on your volume tile, then go to Volume menu – Reinstall SoftRAID Driver
• When prompted, restart — then immediately hold Command-R again to boot into Recovery Mode
• Open Terminal and enter: csrutil enable
• Enter reboot or restart from the Apple menu

Your SoftRAID driver should now load correctly and your volumes should mount normally.