Msahci Service Defaults in Windows 7
MS AHCI 1.0 Standard Driver by Microsoft Corporation.
Default Settings
| Startup type: | Manual |
| Display name: | Msahci |
| Service name: | msahci |
| Service type: | kernel |
| Error control: | critical |
| Group: | SCSI Miniport |
| Path: | %SystemRoot%\system32\DRIVERS\msahci.sys |
| Registry key: | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\msahci |
Default Behavior
Msahci is a kernel device driver. In Windows 7 it won't be started if the user doesn't start it. If Msahci fails to load, Windows 7 attempts to write the error data into Event Log and restart the computer, using the Last Known Good configuration. If the Last Known Good configuration is not valid, Windows 7 startup ends with a Stop error. If you remove or disable the msahci service, Windows 7 won't start.
Restore Default Startup Configuration of Msahci
1. Run the Command Prompt as an administrator.
2. Copy the command below, paste it into the command window and press ENTER:
sc config msahci start= demand
3. Close the command window and restart the computer.
The msahci service is using the msahci.sys file that is located in the C:\Windows\system32\DRIVERS directory. If the file is removed or corrupted, read this article to restore its original version from Windows 7 installation media.