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AHCI and SSD detection issues in BIOS

I've just installed a Corsair Neutron SSD with a fresh install of Windows 7 64-bit. There is also a second HDD connected that I have formatted and is now blank. The motherboard I am using is an ASUS M4A87TD/USB3. I have updated the BIOS to the latest release and I assume I have installed the AHCI drivers because when booting up the PC I can see a startup script that flashes some text with AHCI in it before it disappears and moves on.

The problem that is occurring for me is that I set the SATA ports 1-4 to AHCI mode and ports 5-6 to IDE, (SSD is connected to SATA1, HDD is connected to SATA6) and on the initial boot everything went fine. I started installing NVIDIA drivers and the like. However, when I restarted my computer from there, the BIOS gave an error about being unable to load any OS. I went into the BIOS and saw that my SATA ports 1-4 were now not appearing, and heading to the Boot Priority it showed my blank HDD as the only hard drive available to boot from. So I went to the Hard Disk Priority menu and saw that the SSD was second in line to the HDD. Also, the device labeling was not how I liked it; The HDD read as "SATA: Samsung HD...." and the SSD read as "IDE: Corsair......". The computer booted up fine after I changed hard disk priority but now I am wondering.

Is my SSD really running in AHCI mode or is it being detected as IDE?
I have done the win 7 registry change. The fsutil command comes back 0 so the OS at least thinks it is running AHCI but I do not know what the BIOS is thinking. Also, in the BIOS my SATA configuration settings are still set as ports 1-4 AHCI and ports 5-6 IDE, so that did not change.

Any help on the matter would be greatly appreciated. My next line of thinking was going to be re-downloading the AHCI drivers from ASUS and reinstalling them when I get home form work.
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  1. Best answer
    Why are you setting SATA ports 5-6 in IDE? You could set all of them in AHCI it could solve your problems. I also don't understand why you connect your HDD in port 6? Your HDD would work a lot better in AHCI mode. AHCI isn't only beneficial for SSD, but for HDD as well. So I recommend every drives in AHCI, you could connect your SSD in port 1 and your HDD in port 2 for example. See if you still have issues after.

    Optionally, you could also check for firmware updates for both drives. It's not mandatory and I don't think your problems are coming from there, but it's always a good idea to have up-to-date firmwares.
  2. MC_K7 said:
    Why are you setting SATA ports 5-6 in IDE? You could set all of them in AHCI it could solve your problems. I also don't understand why you connect your HDD in port 6? Your HDD would work a lot better in AHCI mode. AHCI isn't only beneficial for SSD, but for HDD as well. So I recommend every drives in AHCI, you could connect your SSD in port 1 and your HDD in port 2 for example. See if you still have issues after.

    Optionally, you could also check for firmware updates for both drives. It's not mandatory and I don't think your problems are coming from there, but it's always a good idea to have up-to-date firmwares.


    Yea I was thinking that could be it, but I never tried cuz I was short on time and my HDD is a little old so I don't know if it would work with AHCI. I'll have to research the issue and try it when I get home. Thanks
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