04.04.2021 5:09, Karl Dunn wrote:

>> See if the BIOS offers a choice of configuring the controller as SATA 
>> instead of RAID. That worked for me on an Inspiron 1180. (It also made W10 
>> unbootable - apparently each OS occupies its own universe.)
> 
> That worked, precisely as it did for you: gpart list shows partitions and 
> drives much to my expectations, and Win10 no longer boots.  I can boot 
> windows by setting the BIOS config back to RAID.  That's not much of a pain.  
> Now to try installing 12.2-RELEASE on the SSD!
> 
> Thank you very much indeed!

When such host-based RAID/AHCI system came in times of Windows XP, there was a 
way to make it boot Windows
with both kinds of BIOS settings. Boot to Windows in a way it normally boots - 
RAID in your case -
and forcibly add a driver corresponding to PCI ids of the controller in ACHI 
mode,
so Windows kernel already has it at boot time.

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