Windows 10: Change Windows 10 install FROM AHCI to IDE/ATA after installation

I need to change an existing Windows 10 Home 64-bit installation startup drive from AHCI to IDE a step backwards, but is needed to accommodate another operating system in a multi-boot environment. I do not wish to install Windows 10 again. I am able to change the motherboard BIOS setting between AHCI and IDE/ATA and have verified that this is effective. Until I make some change to Windows 10 to allow it to start from IDE/ATA drive, it cannot complete the start-up process in the IDE/ATA mode.


I have found many instructions for Windows 10 on going from IDE to AHCI, but none in the other direction FROM AHCI to IDE/ATA


The procedure below URL DID work for me with Windows 7 when tried previously, but I cannot assume it will work for Windows 10.


I am looking for a step-by-step procedure such as the one posted in April 24 2013 by Balaji Kundalam which was very clear and thorough treatment of the issue for Windows 7 users.


https://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/ahci-to-ata-without-reinstalling-win-7/552c1e9c-71d2-4ba6-9efb-5cb4b3dd543b


Thank you for guidance

:)

 

Win. 7 Fresh install - No S-ATA Driver?

So with it installed in Native Mode but "Raid" not enabled (which is the ONLY option) I have NO AHCI option in the BIOS, it makes no difference then installing it with RAID enabled and having the ICH5 SATA drivers installed rather than IDE ATA drivers?

As of now I have NO SATA drivers in the device manager listed at all even though SATA is enabled in the BIOS but RAID is not. It's all IDE ATA.

 

Win. 7 Fresh install - No S-ATA Driver?

in IDE compatibility mode, they show as IDE drives/controllers. Thats why you bluescreen if you change it on the OS drive without reinstalling windows (it tries to run IDE drivers on a SATA controller)


after actually looking properly at your first post, its only ICH5 - that things SATA I and therefore has no AHCI mode (which came out later)

Your SATA controller is effectively IDE with a sata adapter on top

 

Catalyst 10.9 AHCI question

When I installed the AHCI in my computer in the hardware list it was listing all the SATA in IDE/ATAPI section and written AHCI 1.0. Now that I installed the 10.9 AHCI drive from ATI website its now having only those 4:
-AMD Sata controller
-ATA channel 0
-ATA channel 1
-IDE controller standard double canal PCI.

Do I still have the AHCI function?