AHCI disabled on desktop XPS 8900

I installed a new Samsung 500 gb SSD 850 EVO in my new XPS 8900 to my boot drive. When I select AHCI in the BIOS to work with my SSD, I get a message INACCESSIBLE_BOOT_DEVICE. After some research, it seems that AHCI is disabled and only the RAID is available. In order to optimize my SSD, I need AHCI enabled. How do I do that?

Here's a post on another forum-

Activate the AHCI after installing Windows

You can also do a search on Google for the words there are other methods involving the modification of the registry. You can also reinstall Windows and update the UEFI before you start the reinstallation.

Tags: Dell Drives

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