In the end, after reading several internet resources, I successfully followed a simplified process similar to the Dell documented process:[URL] of the registry-key manipulation described on that page was necessary. My process was: The key difference between this and what I tried initially was the boot into safe mode after changing the BIOS setting. Safe mode caused Windows 11 to switch to using the required driver for the new setting, so that a subsequent full boot into Windows was possible. Nothing else was required, for my system.It's entirely possible that after my initial pass I could have simply switched BIOS settings back to RAID and Windows would have booted up fine. Instead I recovered from my Windows System image. But I would highly suggest to anyone who is about to change these BIOS settings to create a Windows System image and a repair disk just in case, so you do not risk losing your valuable data.
I need to change my BIOS to AHCI to support a dual-boot Linux configuration. I took care to create a Windows System Image on an external drive and a System Repair disc before doing anything else. However, after making the change, and then using the System Repair disc to restore my system image, my laptop won't recognize the drive! What can I do to recover my system image after this change please? -Bob
Can't restore Windows 11 after changing BIOS RAID to AHCI