Error event in the System log when you use the DpmBackup program in System Center Data Protection Manager 2006: "Error code 1@01000003"

This behavior occurs because of how the Virtual Disk Service works with volumes in Microsoft Windows. When the DpmBackup.exe program runs, the volume snapshots that this program generates are mounted as virtual volumes. When a new volume snapshot is created, the Virtual Disk Service calls the IOCTL_STORAGE_GET_DEVICE_NUMBER storage I/O control code to obtain the device number of the new volume. However, because there is no device number associated with a volume snapshot, the Virtual Disk Service provider generates an error and then logs an Error event in the System log.