This page describes how to configure a software RAID on a Windows Server 2003. However, this also applies to all other Windows systems from 2003, such as Windows 7, Windows Vista or Windows Server 2008. Here you will also find instructions for creating an emergency diskette and how to use mirrored hard disks (software raid) to to prevent any emergencies.
AHCI is just a specification or an open interface standard . The throughput of the hard disk is increased by a few percent. This should be deactivated when installing Windows XP, as problems can arise. With Windows 7 and 10, 11, 8, 8.1 you can usually carry out the installation with activated AHCI without any problems!
Information about AHCI or "Advanced Host Controller Interface":
AHCI is supported by MS Windows 11, 10, and older Windows versions as well as Linux operating systems, OS X and others. In Windows Windows, AHCI is not loaded by default if AHCI mode was not enabled at the time of installation