Enable AHCI in Windows 8 and Windows 10 after Installation  

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  1. Ex_Brit
    Posts : 800
    Win10 Pro - x64 latest build dual boot w/Win 11 Pro
       New #20

    Obviously as I was expecting a failed boot or BSOD's at worst....LOL
    BTW Shawn there is an error in step 6...you talk about iAStorv but show iAStorAV in the illustration.. Does that step apply to both?
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  3. Brink
    Posts : 68,840
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       New #21

    Thank you Peter. Corrected. :)
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  4. Ex_Brit
    Posts : 800
    Win10 Pro - x64 latest build dual boot w/Win 11 Pro
       New #22

    Thanks.
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  5. heyitsrick
    Posts : 1
    Windows 10 Home Premium
       New #23

    Just registered to say this process worked on an older (2011) Acer 8172T TravelMate laptop I just upgraded from Win 7 to Win 10. This was given to me used, and I noticed after installing Win 10 that it was ACHI-capable but in IDE mode post-install. This procedure worked well. Tks.
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  7. Brink
    Posts : 68,840
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       New #24

    I'm glad it could help Rick, and welcome to Ten Forums. :)
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  8. rseiler
    Posts : 301
    Windows 10 Enterprise x64 (Insider)
       New #25

    dingorob said:
    In your tutorial above I think you should mention the startoverride subkeys. They need to have 0 dwords too.
    It's worth clarifying that StartOverride is special. It's not the case, like the other values, that 0=AHCI and 3=IDE. Windows actually resets StartOverride to 3 on every boot regardless of AHCI or IDE.

    Changing it to 0 gives Windows the "load driver" signal for the next boot, which is important when changing disk modes. A value of 3 means "do nothing," essentially, which is not what you want for this particular boot.

    It resets to 3 after booting because it would be pointless for Windows to take this action with every boot.
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  9. wwsras
    Posts : 5
    Windows 10
       New #26

    Hello. I've used several methods to activate AHCI in Windows 10 including the instructions posted here. In all cases, after a few days or a week, my system comes to a grinding halt after booting into W10. After waiting many minutes for the system to reboot, and changing my BIOS back to IDE does the system run as expected.

    But even in those situations, I'm starting to see a slow down.

    Is there any reason to believe that if I do a clean W10 install and make sure AHCI is selected in BIOS that I my system might be more stable vs. trying to switch to AHCI when BIOS was originally set to IDE? Should W10 run any smoother after AHCI drivers are installed during a clean install vs switching after the fact?

    Might there be other BIOS changes I need to look at in addition to AHCI?

    Thank you
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  10. Brink
    Posts : 68,840
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       New #27

    Hello wwsras, and welcome to Ten Forums. :)

    Usually a clean install while set to use SATA/AHCI will sort this.
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  11. wwsras
    Posts : 5
    Windows 10
       New #28

    Thanks. I'll give that a try and see if my issues are resolved.
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  13. rseiler
    Posts : 301
    Windows 10 Enterprise x64 (Insider)
       New #29

    Brink said:
    Usually a clean install while set to use SATA/AHCI will sort this.
    What is it about? I've never heard of a system, once switched successfully, suddenly become resistant to it and want to switch back.
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