RAS Asynchronous Media Driver (AsyncMac) Service Defaults in Windows 7

RAS Asynchronous Media Driver.

Default Settings

Startup type:Manual
Display name:RAS Asynchronous Media Driver
Service name:AsyncMac
Service type:kernel
Error control:normal
Path:%SystemRoot%\system32\DRIVERS\asyncmac.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AsyncMac

Default Behavior

RAS Asynchronous Media Driver is a kernel device driver. In Windows 7 it won't be started if the user doesn't start it. If RAS Asynchronous Media Driver fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the AsyncMac service is not running because of the error.

Restore Default Startup Configuration of RAS Asynchronous Media Driver

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config AsyncMac start= demand

3. Close the command window and restart the computer.

The AsyncMac service is using the asyncmac.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.