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Advanced Host Controller Interface

Written By NEO on 5/02/2011 | 5/02/2011 03:55:00 ÖS


As their standard interface, SATA controllers use the AHCI (Advanced Host Controller Interface), allowing advanced features of SATA such as hotplug and native command queuing(NCQ). If AHCI is not enabled by the motherboard and chipset, SATA controllers typically operate in "IDE emulation" mode, which does not allow features of devices to be accessed if the ATA/IDE standard does not support them.
Windows device drivers that are labeled as SATA are often running in IDE emulation mode unless they explicitly state that they are AHCI mode, in RAID mode, or a mode provided by a proprietary driver and command set that was designed to allow access to SATA's advanced features before AHCI became popular. Modern versions of Microsoft WindowsFreeBSD,Linux with version 2.6.19 onward,[6] as well as Solaris and OpenSolaris include support for AHCI, but older OSes such as Windows XP do not. Even in those instances a proprietary driver may have been created for a specific chipset, such as Intel's.[7]

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