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
    2016-08-15T22:49:22+00:00

    My HP product came defaulted to RaidXpert. I had to make those changes to get to AHCI mode.

    If I remember correctly I changed those six registry settings to 0,  then rebooted to BIOS making sure it was in AHCI then rebooted again and if my memory is correct when I got back to the desktop, windows had the sata drivers to update/install and when that was done, verified that in Device Manager,  the IDE/ATAPI controllers were now showing Standard Sata AHCI controller.

    ****************************************************************************************************************************

     I made a notepad to remind myself how to go about it on 9/14 :-

    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".

    note to self go to HKLM as listed change Start to 0 reboot then F10 to BIOS change Storage

    from RAID to AHCI then accept changes then let windows download the necessary drivers.

    Done!!!!

    ***this is for my HP  F-10 is BIOS selection*******************************************************************************

    my processor is AMD so that may be a difference noticed you say you have an Intel....there may be a difference not sure.

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  2. Anonymous
    2016-08-15T02:19:13+00:00

    Hello!

    I am the poor one who did not resolve yet. In my Dell m7510 I have vendor supplied SSD, which BIOS and Intel RST report as PM951 NVMe SAMSUNG 256GB. Interesting to note, that Samsung Magician does not recognize that drive and report it as MP59 1VNeMS MAUSGN2 65BG.

    I was told, that PM951 is OEM version of 950 series, so it is not supported by Magician. Ok, can survive with that.

    However, I have added 850 EVO to my system, and that is reported to operate in non-optimal conditions just because AHCI is not enabled. In BIOS I see SATA mode is RAID. I have tried to change that to AHCI with no luck. All 6 drivers mentioned here - amdsata, atapi, iastorv, msahci, nvstor, nvraid - were changed to start 0. After changing to AHCI, system BSODs quickly, so I can't read exact message there.

    Please advise what else to check.

    Thanks.

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  3. Anonymous
    2016-06-25T16:59:07+00:00

    my issue was wanting migrate my hdd to ssd so i wouldn't lose data that i had accumulated.  a fresh install is always nice but sometimes not advantageous due to the several tb's i would have to upload and install'

    on top of that in doing so noticed i wasn't getting the sata3 speeds i think it was the type mobo used on the model hp pc it looked like [of all things] an intel board that they converted to amd as the cpu holes to attach a heatsink/cooler was drilled for an intel although it had an amd cpu....weird. just one of those hp 'specials' they had in 2012.

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  4. Anonymous
    2016-06-25T16:34:29+00:00

    Back up ~ flatten all ~ disconnect all drives ~ SET THE BIOS ~ load the SSD with (new DVD/ios download) OS ~ connect the (as is) HDD . With the boot left in RAID . RAID setting enables both AHCI and RAID .  The set up that you are going for is great . OS on the SSD , storage on the HDD . You have your work cut out to get it cooking without flattening and re configuring nor re-load/re-config the os . Not sure that cloning is for the light hearted . May need a VERY reliable tech guy who will want a few hungie with no promises . Two different Drives may not RAID together but the system is faster/cooler and safer in RAID . Can that SSD RAID with the HDD ? Research topic . Because there is a fatal flaw with re-setting the boot to AHCI in that doing so will disable the HDD's OS from booting . Of course it would be more simple to 'buy' a new OS DVD or download the iso and load the dvd onto the SSD and partition the HDD to retain the original OS for multi-boot and all your files/software/programmes . Would definitely save time , retain your HDD goodies and the new iso/DVD may even be cheaper than a clone tech guy .

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