Quote: Originally Posted by atlcraig
One other thing - I am not running raid and do not want to. For AHCI to work do you have to be running raid? It was my understanding that you didn't have to. Do you know if this is correct? Thanks again for the help - atlcraig
The answer is NO, you do not have to be in/using RAID for AHCI to work.
AHCI is a separate function from RAID, actually selecting RAID will put the computer in AHCI mode.
Your choices in BIOS are IDE, AHCI or RAID mode.
When you set your computer to RAID (normally the third option in your BIOS) it will set it to AHCI mode.
You can set your computer to RAID (which uses AHCI mode) and not have any HDDs set up in RAID configuration. You will have the advantages of AHCI when in the RAID setting.
The main benefits of AHCI are your HDDs can be HotSwappable (plug and play and unplug, without shutting down the computer), NQR (native command queuing, this allows your HDD to run more efficiently), allows the use of S.M.A.R.T. the HDD monitoring software.
Some people say it will provide a slight, noticeable, speed improvement, I did see an improvement by enabling mine. Also required for SSDs to use Trim function.
Advanced Host Controller Interface (AHCI) is an application programming interface defined by Intel which defines the operation of Serial ATA 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.
Read the wikipedia site linked below and it will explain what AHCI is.
Click here >> Many SATA controllers offer selectable modes of operation