Saturday, 24 March 2018

Event ID - 8193, hr = 0x80070539, Volume Shadow Copy Service error


Volume Shadow Service (VSS) Shadow Copy Optimization Writer' is not functioning correctly. In the event log above the issue involves resolving a SID.

The issue was that the SID being referenced in the event could not be resolved. This was due to a “.bak” entry inside the following registry sub tree.

The Shadow Copy Optimization Writer deletes certain files from volume shadow copies. This is done to minimize the impact of Copy-on-Write I/O during regular I/O on these files on the shadow-copied volume. The files that are deleted are typically temporary files or files that do not contain user or system state.


  • Open regedit and locate 'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\       WindowsNT\CurrentVersion\ProfileList'
  • Under the ProfileList subkey, delete any subkey that is named SID.bak.
Please backup the registry key first, and then delete the entry with the extra “.bak” and then reboot the machine.

Note :- SID is a placeholder for the security identifier (SID) of the user account that is experiencing the problem. The SID.bak subkey should contain a ProfileImagePath registry entry that points to the original profile folder of the user account that is experiencing the problem.

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