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

RAS Asynchronous Media Driver.

Default Settings

Startup type: Manual
Display name:RAS Asynchronous Media Driver
Service name:AsyncMac
Service type:kernel
Error control:normal
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AsyncMac

Default Behavior

RAS Asynchronous Media Driver is a kernel device driver. In Windows XP it won't start until the current user starts it. If the RAS Asynchronous Media Driver fails to start, the technical information about the error is added to the Event Log. Windows XP startup should proceed, but a message box should be displayed informing the user that the AsyncMac service has failed to start.

Restore Default Startup Configuration of RAS Asynchronous Media Driver

1. Run the Command Prompt.

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 XP installation media.