AHCI is the acronym for the Advanced Host Controller Interface. It is a new interface specification that allows the SATA controller driver to support advanced features like Native Command Queuing and Hot Plug.
This BIOS feature controls the AHCI function of the SATA controller.
When enabled, the SATA controller enables its AHCI features when the computer boots up.
When disabled, the SATA controller disables its AHCI functions when the computer boots up.
If you would like to make use of the SATA controller's AHCI features, you should enable this BIOS feature. But please note that enabling this feature requires you to load the SATA controller driver during the Windows XP installation routine.
If you do not intend to use the AHCI features, it's recommended that you disable this BIOS feature. This allows you to use the native Windows XP driver. You won't need to load the SATA controller driver during the Windows XP installation routine.
Please note that changing this BIOS feature after installing the operating system may cause a boot failure. You may be required to reinstall the operating system.
Donc si ton disque sata supporte le NCQ, mieux vaut utiliser ce mode, sinon, rester en IDE. Quand tu parles de lenteur d'install, cela veut dire quoi ?