SATA-related 7B error

Discussion in 'Windows 7' started by gordo999, Aug 25, 2025.

  1. gordo999

    gordo999 MDL Member

    Feb 11, 2019
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    Hi...have not been posting for some time due to personal issues. Tried to fire up a Windows 7 OS on my newer B760M Asus mobo and got the 7B BSOD. Scratched my head for a bit till the lights went on and I realized I cannot take a W7 OS from one mobo (Asus B360M) and insert it into another mobo (Asus B760M) without telling the system in a related INF file what the new device parameter are.

    Besides that dumb error, I discovered something new that I want to share. Part of the reason the 7B BSOD occurs according to Microsoft is that the related SATA services in the registry are set to Start = 3, which means manual start and should be set to Start = 0 which indicated the device driver should be started by the loader. Of course, these Start numbers can be changed in Administrative Tools under Services provided you know which driver to change.

    Here are the two registry entries to check...
    HKLM\System\CurrentControlSet\Services\Iastor and
    HKLM\System\CurrentControlSet\Services\Msahci

    Both of mine were set to Start = 3 and when I changed them to Start = 0, the 7B BSOD went away.

    Now I have another problem, I have to change my USB INF files so my mouse and keyboard will work. I can get the required INF data from W10 by looking in Device Manager.

    Hope that helps someone.
     
  2. EFL

    EFL MDL Novice

    Jun 28, 2025
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    Maybe the VMD is enabled in your BIOS? USB is easy to solve through DrvCeo.