Cannot boot to HDD or Optical when Motherboard in AHCI mode

Posted by Shevek on Super User See other posts from Super User or by Shevek
Published on 2010-03-20T13:29:42Z Indexed on 2010/03/20 13:31 UTC
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Filed under:

ahci

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sata

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motherboard

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boot-failure

I have an Abit AB9 QuadGT motherboard and am trying to swap over to AHCI mode.

I have an existing Windows 7 installation which was installed under IDE mode.

I have set the msahci registry setting to 0.

When I try to boot in AHCI mode I get "DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER".

I have tried booting with my Win 7 DVD in the optical drive.

There is 1 SSD (System), 1 HDD (Data) and 2 optical drives connected via SATA

If I switch back to IDE mode everything boots fine, either from the SSD or from a CD or DVD in the optical drive.

Why can't I use AHCI mode?

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