Attn. SSD owners - Enabling AHCI mode AFTER Windows 10 installation. Solved

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  1.    27 Aug 2015 #11

    Burnz007 said: View Post
    I tried this and now it says Inaccessible Boot Device and it just keeps rebooting in this endless loop. Not sure what to do
    Me too, though even worse I don't even have the error message and bios won't show up! Someone please help!! This happened after putting in the safe mode command prompt.
      My ComputerSystem Spec

  2.    09 Sep 2015 #12

    Registered just to tell OP - thanks, you're awesome, internet HIGH-FIVE!
      My ComputerSystem Spec

  3.    09 Sep 2015 #13

    Toobad said: View Post
    Hello everybody. What started out as a request for guidance ended up with me solving my own problem. Thought I may as well pass on my findings anyway just in case it helps somebody else in the same situation.

    So over the weekend, through a series of upgrades, I successfully hopped from Vista to Windows 10 Professional 64-bit. But, as is not unusual, I again managed to snatch defeat from the jaws of victory. With my new SSD loaded with Win 10 goodness, I realised I was still operating it in IDE mode. A confident dip into the BIOS to enable AHCI mode resulted in Windows then failing to start because it no longer recognised the boot drive! I'm guessing the AHCI driver wasn't loaded during installation since the mode wasn't in use. So back to IDE mode and a surf around for solutions. Plenty around pertaining to Vista, Win 7 and Win 8 involving changing registry values but nothing tangible for Win 10. However I found this alternative Win 8 workaround which I can confirm works equally well in Windows 10. I realise I'm probably teaching my Grandmother to suck eggs with this post here but perhaps somebody as equally technophobic as me, may find it useful. This is what I did:

    1. Run Command Prompt as Admin
    2. Invoke a Safe Mode boot with the command: bcdedit /set {current} safeboot minimal
    3. Restart the PC and enter your BIOS during bootup.
    4. Change from IDE to AHCI mode then Save & Exit.
    5. Windows 10 will launch in Safe Mode.
    6. Right click the Window icon and select to run the Command Prompt in Admin mode from among the various options.
    7. Cancel Safe Mode booting with the command: bcdedit /deletevalue {current} safeboot
    8. Restart your PC once more and this time it will boot up normally but with AHCI mode activated.
    9. Bask in the reflected glory of being a total Windows 10 God
    I tried this and it wouldn't boot in safe mode with AHCI turned on. Also, I tried editing the registry. That didn't work either.
      My ComputerSystem Spec

  4. Posts : 2
    Windows 10 Professional 64-bit
       10 Sep 2015 #14

    Hi all!
    I am writing you from Italy... first of all thanks to Toobad's help, I will try to apply his tutorial to my pc.
    I bought a new SSD for my pc, I installed it and then I upgraded my Win7 pro to the new Win10 pro (64bit), but I didn't get as such speedy improvement as I expected, so I begun reading on the net and I found many tutorials that suggest to activate the AHCI. I tried to follow one of them that suggest to change a value into the regedit but I couldn't find the required voice (I think that perhaps something's changed from Win7 to Win10...). I created manually this voice, restarted the pc and changed from IDE to AHCI into my boot. Starting the PC it went to recovery mode, in an infinite loop.
    So I restored the boot parameters (IDE) and restarted, but probably my regedit new voice wasn't a good idea for Win10.
    Finally I had to use a restore point to launch properly my pc.
    Now I have some fear to touch anything else, but I know that I must to it...
    A question: I installed the SSD into the only free port I had, the nr. 4 (of 6 total); is it better to put it into the first one or is it the same thing?
    This evening I will try again following these steps...
      My ComputerSystem Spec

  5. Posts : 558
    Windows 10
       12 Sep 2015 #15

    I just stuck in a Samsung 850 Pro in my laptop , used the command prompt with a few Diskpart commands and the new SSD showed that it was in ACHI mode so no issues .

    Things usually don't go this well , seems "Samsung's Magician " is still not working or offering "Rapid Mode" in Win 10.
      My ComputerSystem Spec

  6. Posts : 2
    Windows 10 Professional 64-bit
       12 Sep 2015 #16

    Hi, I found somewhere that you should install a previous version (4.4) to allow the Rapid Mode, and than, after the install, update to the latest one. But if you disable it with the last version installed you must uninstall it, install the previous, able it and update Magician... I don't know if it's true or not, I didn't try.
    Anyway thanks to Toobad's suggests I was able to activate properly the AHCI mode and to have a SSD fully working.
    And yes, my pc is faster, but not as faster as I hoped. I am a photographer using software as Adobe Lightroom and Photoshop. I put any file (photos) into the same SSD disk and it's fast, but not very very fast.
    Trying with Magician the benchmark are these:
    Click image for larger version. 

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    Is there something that I could do to improve it or may I be satisfied?
    Thank you!
      My ComputerSystem Spec

  7. Posts : 147
    Windows 10 x64
       12 Sep 2015 #17

    They must have made this a lot easier in Win8.1/10 because I remember doing this on Windows 7 years ago and it was a doable but a nightmare. Glad they finally made this process a little more bearable.
      My ComputerSystem Spec

  8. Posts : 558
    Windows 10
       12 Sep 2015 #18

    I ran the "Magician" software and despite it working i don't think the #'s are accurate , my system feels no different than when i used a much slower SSD.

    Rapid mode does not work yet but i heard that just pumps the #'s but shows no real gain in actual use.
    Attached Thumbnails Attached Thumbnails Screenshot (8).png   Screenshot (9).png   Screenshot (10).png  
      My ComputerSystem Spec

  9.    12 Sep 2015 #19

    I tried this with my win 8.1 and win 10, in the BIOS I changed it to AHCI, it sticks in the BIOS, but samsung magician still says it is in IDE mode.

    Just tried Samsung Magician 4.4 and it can't find my Samsung Evo 850!
      My ComputerSystem Spec

  10. essenbe's Avatar
    Posts : 11,478
    Windows 10 Pro and Windows 10 Pro Insider
       12 Sep 2015 #20

    If you look in Device Manager under IDE ATA/ATAPI Controllers and at the bottom see the AHCI drivers, you are in AHCI mode. Just make sure you are connected to a port controlled by the Chipset (0-3 is usually recommended). Here is mine.

    Click image for larger version. 

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    Here is a Tutorial on how to do it. It works in Windows 7 and Windows 8/8.1, I haven't tried it in Windows 10 yet, but it should work.
    AHCI : Enable in Windows 7 / Vista - Windows 7 Help Forums
      My ComputersSystem Spec

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