Rerun the consistency check and see if it resolves this issue. 2) Check to see if your disks are connected properly to the ...

1) Rerun the consistency check and see if it resolves this issue. 
2) Check to see if your disks are connected properly to the DPM server. If there are any disk cabling issues, rectify them and then run consistency check. 
3) If you are certain that you do not have any disk cabling issues, clear the VSS fault. Next, run chkdsk on %VolumeName; and finally run consistency check.