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Thread: Gigabyte EP45 UD3P (rev 1.0) Not Detecting SSD/HDD In AHCI Mode




  1. #11
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    Default Re: Gigabyte EP45 UD3P (rev 1.0) Not Detecting SSD/HDD In AHCI Mode

    If I change the registry and then reboot and change the BIOS, once I change the BIOS settings back to AHCI I cannot get to the OS.

    The BIOS freeses up when detecting the AHCI drives. I can't do anything. If I press the delete key to try and enter the BIOS, I can't event get there. I have to reset the BIOS to change it back to IDE so that the computer will boot.

  2. #12
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    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Gigabyte EP45 UD3P (rev 1.0) Not Detecting SSD/HDD In AHCI Mode

    What OS is this? If it is windows 7 or Vista then that is all you need to do if you have your OS drive in the Intel ports (Use SATA2_0).

    If this is XP you can't do the above, you will need to do a clean install.

    You are setting the AHCI at the top of the Integrated Peripherals list, not the bottom ones right?

  3. #13
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    Default Re: Gigabyte EP45 UD3P (rev 1.0) Not Detecting SSD/HDD In AHCI Mode

    I am running Windows 7 ultimate. I was running windows 7 home but wanted more features so went with ultimate. I was running ahci with no problems. I installed windows 7 ultimate and now when I set the drives to ahci in the bios I can't get past the AHCI BIOS to install or run anything.

    I have to clear the BIOS by jumping the reset pins on the MB and then run the drives in IDE to reboot.

    I have read other threads that refer to resetting the DMI. Does resetting the BIOS do that? Also, is there a setting somewhere in the BIOS to reset DMI?

    Should I try and run a bios updater? I don't have a floppy drive.

    any help is appreciated.

  4. #14
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    Default Re: Gigabyte EP45 UD3P (rev 1.0) Not Detecting SSD/HDD In AHCI Mode

    I updated my BIOS and now it's working!!

    dunno what the problem was but I"m happy now, thanks!!

  5. #15
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    Default Re: Gigabyte EP45 UD3P (rev 1.0) Not Detecting SSD/HDD In AHCI Mode

    Quote Originally Posted by Lsdmeasap View Post
    To use AHCI mode you need to make the above mentioned registry changes...
    The issue has nothing to do with the Registry, or even the OS: it's a BIOS issue. Not being able to properly see the HD happens way before the OS begins to load. Unless the BIOS properly handles the hard drives nothing will work properly. Stop telling people to modify their Registry files when the computer hardware doesn't properly recognize the hardware!

    (FWIW, I installed Win 7 in IDE mode, modified the registry to add AHCI mode and changed the BIOS to AHCI and the computer appeared to run fine. The it began to crash at times coming out of, or going into sleep mode. Changed everything back to IDE mode and haven't had a problem since. This is with an EP45-UD3L MB.)

  6. #16
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    Default Re: Gigabyte EP45 UD3P (rev 1.0) Not Detecting SSD/HDD In AHCI Mode

    Quote Originally Posted by blindguy View Post
    I updated my BIOS and now it's working!!

    dunno what the problem was but I"m happy now, thanks!!
    Nice to see!

    I was about to suggest that next, or updating to a newer one if possible, if you continued to have issues

    Glad you got it going now!

    Quote Originally Posted by b_rubenstein View Post
    The issue has nothing to do with the Registry, or even the OS: it's a BIOS issue. Not being able to properly see the HD happens way before the OS begins to load. Unless the BIOS properly handles the hard drives nothing will work properly. Stop telling people to modify their Registry files when the computer hardware doesn't properly recognize the hardware!

    (FWIW, I installed Win 7 in IDE mode, modified the registry to add AHCI mode and changed the BIOS to AHCI and the computer appeared to run fine. The it began to crash at times coming out of, or going into sleep mode. Changed everything back to IDE mode and haven't had a problem since. This is with an EP45-UD3L MB.)
    This is perfectly fine, and expected/needed, he was trying to switch back and forth from IDE to AHCI after installing windows.

    I would not suggest any registry changes that could cause anyone any harm!

    These changes are fine to use and do not cause any issues, only allow the OS to be able to boot from either disk methods.
    Error message when you start a Windows 7 or Windows Vista-based computer after you change the SATA mode of the boot drive: "STOP 0x0000007B INACCESSABLE_BOOT_DEVICE"

    Error message when you start a Windows 7-based computer after you attach a RAID disk: "STOP 0x0000007B INACCESSABLE_BOOT_DEVICE"

    If you have sleep issues I suspect you are not as stable as you think, since it works for you in IDE mode then your BIOS version is new enough that it's fixed so that can't be the issue, so it really only leaves stability

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