Can I get an answer to the above? When installing Windows 7 and wanting the latest driver for AHCI, not RAID, which driver do I install during OS installation for AHCI: the iaStor.sys as shown above? Your iaAHCI.inf seems to be for RAID. On the other hand, perhaps installing after OS installation to update driver is another option in Windows 7 since Microsoft installs an AHCI driver by default (if BIOS set to AHCI), but my question is about updating that driver to the latest version either during or after OS installation.