Changing from RAID to AHCI

Anonymous
2010-10-28T12:24:52+00:00

Hi,

on my Dell E6510 I have my disk drive set to RAID mode. I have issues using the eSata port so I want to switch to AHCI. I followed the instructions here:http://support.microsoft.com/kb/922976. However when I boot my system after setting the disk mode to AHCI in the BIOS I see the Windows logo (using Win7 x64) and some seconds later I get a bluescreen with a message I can't read because the system is rebooting. Changing the BIOS back to RAID brings up the system again...

Anything I can do to make AHCI working?

Thanks,

Thomas Pagel

Windows for home | Previous Windows versions | Devices and drivers

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Anonymous
2010-11-03T18:05:23+00:00

Hi Thomas,

Thank you for your post.

I believe I have the solution to your problem and I verified it against a Dell machine that has similar controller with your machine. Changing from AHCI to RAID,http://support.microsoft.com/kb/922976 fix will work.  

Changing from RAID to AHCI, you need one more step. Msahci driver requires Atapi.sys miniport to be loaded during boot as well. So you need to change theStart value to 0 for both of the following entries in your registry. You can use regedit.exe utility. 

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\msahci

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\atapi

Or you can also simply run the below command lines in an elevated window.

REG ADD HKLM\System\CurrentControlSet\Services\msahci /v Start /d 0 /f /t REG_DWORDREG ADD HKLM\System\CurrentControlSet\Services\atapi /v Start /d 0 /f /t REG_DWORD

Regards

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  1. Anonymous
    2014-10-30T17:22:28+00:00

    Very Thanks, 

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\msahci

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\atapi

    my windows run perfectly from raid to ahci. THANKS !!!! :)

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  2. Anonymous
    2014-09-22T20:48:53+00:00

    HP AMD owners!!!   I'll be a S.O.B....after dealing with this issue for months and months found this post from Toms Hardware and it works!!! I was able to clone/migrate my HP Win7x64 Hm Prem OS to a Samslung    (that's right it almost got slung) 840 SSD did all the listed registry changes (from 3 to 0 in Start) reboot go to F10 change the Storage from RAID to AHCI and bingo it booted up and when it did Windows downloaded all the necessary drivers and did another restart, man no more doing clean installs in AHCI mode!!!!

    One caveat I found iaStorV (rather than iaStor) changed it to 0 in the Start path... was kinda crossing my fingers on that one..but sports fans it works!

    Thank you all I owe somebody a beer.

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  3. Anonymous
    2014-07-08T14:37:24+00:00

    This worked for our firm, on a Latitude E5530.

    Here is a script for all the registry changes that need to be made.

    REG ADD HKLM\System\CurrentControlSet\Services\msahci /v Start /d 0 /f /t REG_DWORD

    REG ADD HKLM\System\CurrentControlSet\Services\atapi /v Start /d 0 /f /t REG_DWORD

    REG ADD HKLM\System\CurrentControlSet\Services\amdsata /v Start /d 0 /f /t REG_DWORD

    REG ADD HKLM\System\CurrentControlSet\Services\nvstor /v Start /d 0 /f /t REG_DWORD

    REG ADD HKLM\System\CurrentControlSet\Services\nvraid /v Start /d 0 /f /t REG_DWORD

    REG ADD HKLM\System\CurrentControlSet\Services\iaStor /v Start /d 0 /f /t REG_DWORD

    I think the most important changes were to "msahci" and "atapi".

    Thank you again everyone for the insight, this helped me out!

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  4. Anonymous
    2014-04-05T16:45:37+00:00

    I had a similar situation with attempting to 'clone' an existing Windows 7 configuration on a Dell Vostro 200 to a new Dell Optiplex 3010. The Vostro 200 only supports ATA mode in native IDE and RAID, and the system would not boot beyond the splash screen (typical when changing ATA mode from IDE to AHCI or vice versa with Windows 7).  This is exactly what I needed to get running properly in AHCI mode on the new machine.

    Thanks a TON!

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