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