Event ID 55 is being logged on the BE server respectively the Hyper-V Host when backing up a Windows 2012 Virtual Machine (VMWare and Hyper-V)

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  • Article ID:000020782


Event ID 55 is being logged twice on the Backup Exec Media Server during the backup of a Windows 2012 Virtual Machine (VMWare) with Granular Restore Technology (GRT) enabled.

This Event ID is not being reported when GRT is not enabled.

Event ID 55 is being logged twice on the Hyper-V Host during the backup of a Windows 2012 Virtual Machine (Hyper-V).


Error Message

Log Name:   System
Source:        Ntfs
Date:            Date
Event ID:      55
Task Category: (2)
Level:           Error
Keywords:    Classic
User:            N/A
Computer:    MEDIASERVER
The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume .


This issue occurs when a VM containing a Windows 2012 NTFS file system is mounted on a Windows 2008 media server. Previous versions of the NTFS file system have issues interpreting the data from VM disk images that contain Windows 2012 NTFS file systems.  To bypass this issue, Backup Exec uses redo logging to repair the perceived corrupted file system prior to GRT cataloging.  However, the Event ID 55 is reported prior to that process occurring when the disk is initially mounted. It should be noted that the actual data on the VMDK is not written to, and is in no way affected by this error during the mount and read of the VM disk image.


If required; disable GRT but otherwise ignore the Event ID for the time being.

The Backup Exec Media Server Operating System should be at least the same version as the Operating System of the VM being backed up via GRT to avoid this alert being created.




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