AHCI Samsung 840 evo not recognized in biois startup but seen in boot menu as IDE

jpchappell

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Jun 14, 2014
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This is my first time posting to a tech forum. I will try to present all pertinent info. I recently cloned my hhd to a Samsung 840 evo 256mb. Here is my pertinent hardware info. If anything else is needed let me know

MSI 790fx-gd70 (AMD)
bios version 1.6
Windows 7
Samsung 840 EVO 256 GB

I have heard that to take advantage of the ssd I should set my bios setting to AHCI. I changed the registry setting msahci to 0 in Windows 7. I rebooted, entered bios, went to Integrated Peripheral, then On-Chip ATA Devices, and changed RAID Mode to AHCI from IDE. For some reason the BIOS refers to the SATA mode as the RAID mode, which is confusing.

When I save and reboot, the BIOS initially does not detect my SSD, as it did in IDE Mode. It then goes to a screen where it indicates that it is initalizing the AHCI. It then briefly shows the drives, including the Samsung before hanging up and going to a screen where it is just a blinking cursor.

If I enter the BIOS boot menu, I can boot from the "IDE: Samsung 840 evo" option. When I did this, the system booted, Windows 7 installed the AHCI drivers and rebooted, but the BIOS will still hang up unless I go to Boot Menu and select "IDE: Samsung ..." or I change the RAID Mode setting back to IDE.

A couple of caveats: I do not want to have to reinstall Windows 7 if it can be avoided. And 2. I have never updated my BIOS and am leery of doing so if I don't have to (unless it has been shown to solve the problem) as I don't want to irrevocably crash my system.

So, how do i change my bios to AHCI without locking up my system on boot. Should the boot menu show my Samsung as IDE even though i have changed BIOS setting to AHCI. And finally, is all this aggravation worth it just to get AHCI working? Thanks for all your help.
 
1) Update the BIOS.
That may be your problem. If not we can investigate further after you do that.

2) Your motherboard has a feature to help prevent a corrupted BIOS FLASH from bricking your motherboard. Read your motherboard manual about M-Flash.

3) I don't think you mean "BIOS will hang up" I think you mean the boot process hangs up. If the BIOS failed to start you couldn't enter the BIOS.

*I've got a feeling the main problem is it doesn't like the settings you changed in Windows so that you may have to reinstall Windows.
 
1) Update the BIOS.
That may be your problem. If not we can investigate further after you do that.

2) Your motherboard has a feature to help prevent a corrupted BIOS FLASH from bricking your motherboard. Read your motherboard manual about M-Flash.

3) I don't think you mean "BIOS will hang up" I think you mean the boot process hangs up. If the BIOS failed to start you couldn't enter the BIOS.

*I've got a feeling the main problem is it doesn't like the settings you changed in Windows so that you may have to reinstall Windows.
 

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