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AHCI mode error on new SSD install

I just installed a 120GB Crucial M500 on my desktop. Everything is working fine except when I enable AHCI mode, I am not able to boot into windows. The computer goes into a loop of bios-->windows starting up-->windows recovery mode. I switched back to PATA mode and its working fine now. I've read all over that AHCI mode should be enabled for SSDs so I'm not sure why its not working for me.
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  1. Best answer
    It's not working for you because AHCI has to be enabled in BIOS before you install Windows on a SSD.
    If the SSD is in IDE mode and you install Windows on it you can't then switch to AHCI mode without having problems.

    Edit your Windows Registry File, then reboot into BIOS and change SATA mode to AHCI.
    Follow these instructions on how to edit the registry file: http://www.ocztechnologyforum.com/forum/content.php?286-Change-from-IDE-to-AHCI-after-Installation
  2. You probably didn't load/enable AHCI when Win was installed - so make sure you have the drivers loaded from your mobo site,

    Then take the following

    Windows Registry Editor Version 5.00

    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\msahci]
    "Start"=dword:00000000

    copy and paste it into notepad, set it as a txt file and save as AHCI.REG to the desktop, then double click on it, it will ask if you want to merge it into the registry, tell it Yes, when done reboot and should be good to go
  3. Dereck47 said:
    It's not working for you because AHCI has to be enabled in BIOS before you install Windows on a SSD.
    If the SSD is in IDE mode and you install Windows on it you can't then switch to AHCI mode without having problems.

    Edit your Windows Registry File, then reboot into BIOS and change SATA mode to AHCI.
    Follow these instructions on how to edit the registry file: http://www.ocztechnologyforum.com/forum/content.php?286-Change-from-IDE-to-AHCI-after-Installation


    Thanks! I followed that article and it did the trick. I want to make sure the steps lead to the same results as if I had enabled AHCI before installing Win7? In other words, I'm not missing out on any performance, etc. by doing it this way, right?
  4. Correct, you get the same performance results.
  5. Dereck47 said:
    Correct, you get the same performance results.


    Awesome, thanks Dereck. Tradesman1, thank you to your as well.
  6. No worries, that's why we are here ;)
  7. Ok, a follow-up. Not sure if this started after enabling AHCI but I don't recall it prior. I have dual drives and now I have the "Safely remove hardware and eject media" icon where it will let me eject both my drives. I would definitely like to get rid of that option.
  8. Might be you have hot swap enabaled
  9. Tradesman1 said:
    Might be you have hot swap enabaled

    Not sure what that is but is it something to look for in the BIOS?
    I have this motherboard: http://www.gigabyte.com/products/product-page.aspx?pid=2989&dl=1#dl
    I want to see if I need to update the AHCI driver but not sure where to check what version I have now.
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