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Setting non-AHCI mode (i.e. IDE or Combined mode) in the BIOS will allow the user to boot into Windows, and thereby the required registry change can be performed. Consequently, the user then has the option of continuing to use the system in Combined mode or switching to AHCI mode. [8]
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 problem is you get a board that came set up for IDE mode or you set it to IDE mode to avoid the need to use a floppy or slipstream or to use an older linux distro or whatever. Then sometime later you come to add a hard drive or or optical drive and find that half your disk controller ports are unusable without switching to ahci mode.
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 ...
[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.
Advanced Configuration and Power Interface (ACPI) is an open standard that operating systems can use to discover and configure computer hardware components, to perform power management (e.g. putting unused hardware components to sleep), auto configuration (e.g. Plug and Play and hot swapping), and status monitoring.
Furthermore, on a modern x86 system, BIOS calls can only be performed in Real mode, or Virtual 8086 mode. v8086 is not an option in Long mode. This means that a modern operating system, which operates in Protected mode (32 bit), or Long mode (64 bit), would need to switch into real mode and back to call the BIOS - a hugely expensive operation.
This BIOS adds the ability to switch the drive mode into AHCI. Lenovo states that these BIOSes should not be used for Windows operating systems (obviously as they prefer most users to remain on the industry supported bios, unless they have a reason not to.) [ 43 ]