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

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

0 comments
Answer accepted by question author
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

Was this answer helpful?

100+ people found this answer helpful.
0 comments

54 additional answers

Sort by: Newest
Most helpful Newest Oldest
  1. 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.

    Was this answer helpful?

    0 comments
  2. 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.

    Was this answer helpful?

    0 comments
  3. 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 .

    Was this answer helpful?

    0 comments
  4. Anonymous
    2016-06-25T15:19:40+00:00

    That is 100% correct. HP products have set themselves to boot up in RAID as default...grrr. Something called RaidXpert or something like that...especially desktop models...laptops I'm not too sure about those as they usually only have one hard drive [some have a space for another] but the desktops for sure.

    There's an earlier post on this that shows all the registry settings that need to be changed if you are already in the HP 'RAIDXpert' mode..that registry list will show you which registry files to revert the settings back to ALL the ACHI modes...like about six or so registry settings.

    A few years back was trying to migrate my HP OEM HDD to SSD and the Samsung Migration Tool kept telling me I wasn't in SATA III and for the longest time couldn't figure out why....even talking to HP IT specialist they couldn't figure it out...come to find out ALL of the ACHI registry settings have to be re-set for it to function in SATA III...and what that did is when rebooting it put the standard Microsoft SATA drivers in thus enabling SATA III speeds. 

    I found a notepad I made listing them all:

    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

    set these six

    msahci

    atapi

    amdsata [if u have AMD]

    nvstor

    nvraid

    iaStor

    Was this answer helpful?

    0 comments