Are you saying that the Windows installer doesn't know how to use storage interfaces that the final installed Windows system would know how to use, and furtherm

Are you saying that the Windows installer doesn't know how to use storage interfaces that the final installed Windows system would know how to use, and furthermore that those include storage interfaces that might be used for the boot drive? So in order to install, you have to get an RST driver and somehow load it into the installer, but after that the system will work? After reading the Dell documentation... yeah, that's exactly the situation. A laptop only has one drive BTW.