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Some operating systems, notably Windows Vista, Windows 7, Windows 8, Windows 8.1 and Windows 10, do not configure themselves to load the AHCI driver upon boot if the SATA controller was not in AHCI mode at the time the operating system was installed. Although this is an easily rectifiable condition, it remains an ongoing issue with the AHCI ...
If AHCI is not enabled by the motherboard and chipset, SATA controllers typically operate in "IDE [b] emulation" mode, which does not allow access to device features not supported by the ATA (also called IDE) standard. Windows device drivers that are labeled as SATA are often running in IDE emulation mode unless they explicitly state that they ...
When enabled via the AHCI controller, this allows the SATA host bus adapter to enter a low-power state during periods of inactivity, thus saving energy. The drawback to this is increased periodic latency as the drive must be re-activated and brought back on-line before it can be used, and this will often appear as a delay to the end-user.
The first mode is the Intel driver SATA normal and the latter mode is a fake RAID. [1] Up to version 4 it is included on Intel Application Accelerator RAID Edition , [ 2 ] between versions 5 and 8.9 it is included on Intel Matrix Storage Manager ( IMSM ), since version 9 it is included on Intel Rapid Storage Technology ( IRST ) preferring the ...
(That integration was not new with IDE, having been done a few years earlier with SCSI drives.) Moving the HDD controller from the interface card to the disk drive helped to standardize the host/controller interface, reduce the programming complexity in the host device driver, and reduced system cost and complexity.
[4] [5] Linux kernels support AHCI natively since version 2.6.19, and FreeBSD fully supports AHCI since version 8.0. Windows Vista and Windows 7 also natively support AHCI, but their AHCI support (via the msahci service) must be manually enabled via registry editing if controller support was not present during their initial install.
Windows XP can be installed in IDE mode but without SATA features enabled. For users that dual boot Windows XP with another operating system installed in AHCI mode, this means changing to IDE mode every time to boot into Windows XP and changing back to SATA to boot the other OS, or installing the other OS which supports AHCI also in IDE mode to ...
It is confirmed that with native Microsoft drivers the TRIM command works on Windows 7 in AHCI and legacy IDE / ATA Mode. [44] Windows 8 and later Windows operating systems support the unmap command for devices that use the SCSI driver stack, including USB Attached SCSI Protocol (UASP). Windows 8.1 and later Windows operating systems support ...