You receive an “Unable to create a shadow copy” error after you remove a volume in Windows Server 2003.

http://support.microsoft.com/kb/833779

Event Type: Error
Event Source: VSS
Event ID: 7001
Computer: Computername Description: VssAdmin: Unable to create a shadow copy:
Either the specified volume was not found or it is not a local volume.
‘C:\WINNT\system32\vssadmin.exe Create Shadow /AutoRetry=5 /For=\\?\Volume{volume}\’.

A Volume Shadow Copy Service (VSS) update package is available for Windows Server 2003

http://support.microsoft.com/kb/833167

VSS writers and inconsistent shadow copies

http://blogs.msdn.com/adioltean/archive/2005/08/31/458907.aspx