Updating ata controller for windows
For this reason, Intel recommends changing the drive controller to AHCI or RAID before installing an operating system.
AHCI gives software developers and hardware designers a standard method for detecting, configuring, and programming SATA/AHCI adapters.
AHCI is separate from the SATA 3 Gbit/s standard, although it exposes SATA's advanced capabilities (such as hot swapping and native command queuing) such that host systems can utilize them.
Legacy mode is a software backward-compatibility mechanism intended to allow the SATA controller to run in legacy operating systems which are not SATA-aware or where a driver does not exist to make the operating system SATA-aware.
When a SATA controller is configured to operate in legacy mode, the number of storage devices per controller is usually limited to four (two IDE channels, primary and secondary, with up to two devices per channel), compared to the maximum of 32 devices/ports when configured in AHCI mode.
Older versions of operating systems require hardware-specific drivers in order to support AHCI.
The Advanced Host Controller Interface (AHCI) is a technical standard defined by Intel that specifies the operation of Serial ATA (SATA) host bus adapters in a non-implementation-specific manner.
The specification describes a system memory structure for computer hardware vendors to exchange data between host system memory and attached storage devices.