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TweakTown's Ultimate Windows SSD Performance Installation Guide

By: Jon Coulter | Guides | Posted: Nov 5, 2014 11:05 pm

AHCI to RAID or RAID to AHCI

 

So, you've decided that you want to change storage modes for one reason or another. You go into your BIOS, and change your storage mode from AHCI to RAID, or RAID to AHCI, and reboot only to be greeted with a BSOD. Looks like you will have to reinstall Windows, which sucks because you have a million programs installed and running just right.

 

Well, there is an easy way. A quick couple of registry changes, and you will be able to boot into Windows in the storage mode of your choice. Make these registry changes, and Windows will boot up with the appropriate driver for the storage mode you want to change, without having to reinstall Windows and all that software.

 

Typically, users want to change from AHCI mode to RAID mode after learning how much better storage performance and flexibility RAID has to offer. Let's cover that scenario first. The first step is to open Windows registry editor. In your search bar, type "regedit,"then right click on the icon that pops up, and select "run as administrator."

 

Windows 8 users, navigate to:

HKEY_LOCAL_MACHINE System CurrentControlSet Services storahci.

Right click on the "Start" parameter, hit "modify," and edit the value data, changing the zero to a three. Entering a three disables the startup of a driver, and we want to disable the startup of the AHCI driver, and load the RAID driver instead.

 

tweaktown_s_ultimate_windows_ssd_performance_installation_guide_123

 

Windows 7 users, navigate to:

HKEY_LOCAL_MACHINE System CurrentControlSet Services msahci.

Right click on the "Start" parameter, hit "modify," and edit the value data, changing the zero to a three.

 

Next, we need to enable the RAID driver to start up at boot.

 

Windows 8 users, navigate to: HKEY_LOCAL_MACHINE System CurrentControlSet Services iaStorV StartOverride.

Right click on "REG_DWORD," and change the value data from three to zero.

 

tweaktown_s_ultimate_windows_ssd_performance_installation_guide_124

 

Windows 7 users, navigate to:

HKEY_LOCAL_MACHINE System CurrentControlSet Services iaStorV.

Right click on the "Start" parameter, hit "modify," and edit the value data, changing the three to a zero. Hit "OK," and exit the Registry Editor.

 

Now, reboot, enter your motherboards BIOS, and change SATA Mode from AHCI to RAID. Reboot again, and Windows will load with the built-in Windows RAID driver.

 

At this point, if you were running an IRST storage driver, you will need to uninstall it, and then re-install it for functionality.

 

If you want to be able to switch from AHCI to RAID, and back again, then you can just leave both registry entries set at zero. If you are running an IRST driver, and want to have the capability to switch modes at will, then you need to change one more registry entry from three to zero.

 

Windows 8 users, navigate to: HKEY_LOCAL_MACHINE System CurrentControlSet Services iaStorAV StartOverride.

Right click on "REG_DWORD," and change the value data from three to zero.

 

tweaktown_s_ultimate_windows_ssd_performance_installation_guide_125

 

Windows 7 users, navigate to:

HKEY_LOCAL_MACHINE System CurrentControlSet Services iaStorAV.

Right click on the "Start" parameter, hit "modify," and edit the value data, changing the three to a zero. Hit "OK," and exit the Registry Editor.

 

Now you can change from RAID to AHCI. There is really no reason I can think of to do this maneuver, unless you want to run a single drive and enable caching software that only functions in AHCI mode. To go backward, as it were, just do the exact opposite:

 

Windows 8 users, navigate to:

HKEY_LOCAL_MACHINE System CurrentControlSet Services storahci.

Right click on the "Start" parameter, hit "modify," and edit the value data, changing the three to a zero.

 

Windows 7 users, navigate to:

HKEY_LOCAL_MACHINE System CurrentControlSet Services msahci.

Right click on the "Start" parameter, hit "modify," and edit the value data, changing the three to a zero.

 

Next, disable RAID driver.

 

Windows 8 users, navigate to: HKEY_LOCAL_MACHINE System CurrentControlSet Services iaStorV StartOverride.

Right click on "REG_DWORD," and change the value data from zero to three.

 

tweaktown_s_ultimate_windows_ssd_performance_installation_guide_126

 

Windows 7 users, navigate to:

HKEY_LOCAL_MACHINE System CurrentControlSet Services iaStorV.

Right click on the "Start" parameter, hit "modify," and edit the value data, changing the zero to a three.

 

You may want to disable the IRST RAID driver as well.

 

Windows 8 users, navigate to: HKEY_LOCAL_MACHINE System CurrentControlSet Services iaStorAV StartOverride.

Right click on "REG_DWORD," and change the value data from zero to three.

 

Windows 7 users, navigate to:

HKEY_LOCAL_MACHINE System CurrentControlSet Services iaStorAV.

Right click on the "Start" parameter, hit "modify," and edit the value data, changing the zero to a three. Hit "OK," and exit the Registry Editor.

 

Now, reboot, enter your motherboards BIOS, and change SATA Mode from RAID to AHCI. Reboot again, and now Windows will load with the built-in Windows AHCI driver.

 

At this point, if you were running an IRST storage driver, then you will need to uninstall it, and then re-install it for functionality.

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