I have installed Windows 7 on my PC (Gigabyte ga-p55-ud5) with the SATA controller set on RAID mode. After that, I've decided to try to install Mac OS X and to do so I had to set my SATA controller to AHCI.

Windows 7 only starts if I set it to RAID, Mac OS X only if I set it to AHCI.

Is there any way to let Windows 7 boot in AHCI mode without installing it from scratch?


Windows 7 doesn't have AHCI drivers loaded by default. Boot with raid, then enable the AHCI drivers then restart and enable AHCI in the bios. This KB explains how to., but is not a complete guide.

See this page for additional suggestions if the MS article does not work for your situation.


The problem is that you installed Windows 7 while in raid mode. If you had installed it while the motherboard was in AHCI mode.

I do not have links, but in my experience, when changing the mode in bios it prompts you about that issue and I have had booting issues when it wasn't set to the mode the OS was installed in.


You can also just boot into Safe Mode. Windows will automatically reenable the AHCI drivers. You will then be able to boot normally. This applies to Windows 10 as well.

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