Failed AHCI change from RAID on Dell 5500, w10p 1909,

  1. Posts : 97
    10pro 20H2 19042.1237

    Failed AHCI change from RAID on Dell 5500, w10p 1909,

    Followed this tutorial -
    Enable AHCI in Windows 8 and Windows 10 after Installation
    Printed it and did it carefully step-by-step. Found each and every bit in registry.

    Reason is to get a Linux distro to see the WinOS and others(penguins) have found that many Dell laptops are not set to AHCI.
    Previous bios settings were RAID (never changed by me) - this was the third of 3 options - Disabled, AHCI, RAID.
    After following steps in tutorial made the change from RAID to AHCI in Bios (made no other changes).

    Machine failed to restart into Windows, repeated boot loops (as far as I could tell) and the Dell SupportAssist muscled in twice trying to get a download of a complete image - cancelled by me).
    Eventually Windows presented a blue recovery box with "Restart" or "Advanced options".
    Tried both .. only ever choosing restart within advanced though.
    Repeated fails.

    Went back to BIOS and reverted to RAID = success and back into w10p.
    All I want to achieve is for Linux to "see" Windows folders/files just like the old days with w7p .... ahhh, those were the days.

    Machine = Dell 2019 version Latitude 5500, i5 8th gen, 16GB ram, 256 nvme ssd with w10p 1909 build (up-to-date), storage microSD in slot (no boot or OS on it), nothing else connected/plugged in.

    Checked regedit for those values and found these...
    ...Services\iaStorV = start still set to '0' value data
    ...Services\iaStorAVC\StartOverride = Value Name is '1' not '0' and value data is '3'
    ...Services\storahci = Start still set to '0' value data
    ...Services\storahci\StartOverride = Value Name is '1' not '0' and value data is '3'
    Last edited by Pavl; 01 May 2021 at 02:52. Reason: Added current reget values.
      My Computers

  2. Posts : 400
    windows 10

    Try this method:
    1. Run MSCONFIG
    2. Enable Safe Boot (minimal)
    3. Reboot into UEFI / BIOS and change to AHCI
    4. Boot up into safe mode
    5. Run MSCONFIG and disable Safe Boot.
    6. Reboot

    Failed AHCI change from RAID on Dell 5500, w10p 1909,-safe-boot-scn-1.jpg
      My Computer

  3. Posts : 97
    10pro 20H2 19042.1237
    Thread Starter

    Thank you "itsme1"
    Will try that method and have seen another mention of the safe boot version elsewhere but wanted to check first as there have been some warnings (cannot find this forum post) of Blue Screen and no boot if I get this wrong.
    Day job in the way so will try tonight.

    - - - Updated - - -

    Thank you again "itsme1"
    Success .. after a heart stopping moment when login password was repeatedly rejected in safe mode ..... I normally use fingerprint but know my password (PIN) for 'Hello' and have it written down etc etc ...
    Luckily I had previously enabled the "hidden" admin account and so was able to use that password to get back in.
    Did as you described and am now back into normal w10p environment under my own account (fingerprint fine).
    Tested Linux from usb and it now 'sees' the windows directories and allows access to them.

    Is there a chance of this method being added to the tutorial ?
    And I still dont know why this machine's settings differ from those from Brink's tutorial nor why my attempt failed.

    Anyway ... thanks again and can now use my Gecko.
      My Computers

  4. Posts : 400
    windows 10

    okay nice.

    Since windows 7 I have known these 2 methods, that of the registry and that with msconfig. I have always used the msconfig method because for me it is automated, if windows needs to change values in the registry it will do it correctly. I never had a problem with this method.

    Don't worry about your values in the registry, if they are different from the tutorial then there is a good reason, and your pc works fine with those values.

    If you want to include this method in the tutorial, you can ask brink.
      My Computer


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