How to Fix Disk Signature Error PartMgr 58

The disk signature error "PartMgr" ID 58 may occur on its own or when a virtual machine backup is initiated.

You'll need to check whether there are disks that have the same disk signature.

In the case of Hyper-V, check if any of the VM disks inside the VM have the same disk signature as a host disk.

This error may occur as a result of a Disk2VHD P2V conversion.


The error usually shows up in the Event Viewer System logs:

	Log Name: System

	Source: partmgr

	Event ID: 58

	Task Category: None

	Level: Warning


	The disk signature of disk X is equal to the disk signature of disk Y.


To view the disk signature, open the command prompt as administrator and:



The above command lists all disks, then


N is the number of the disk you would like to acces

Now the disk signature will be displayed, such as 0805dae1


To change the disk signature:

The disk signature wil then be updated to contain the byte value you entered.


Hint: Use BackupChain backup software and its VSS Diagnosis feature to test out your system.

More Info on BackupChain

BackupChain is a backup software for Windows and includes cloud backup and Windows Server 2012 backup amongst other modules that allow IT pros worldwide to protect their server farms.
BackupChain has also free virtual machine backup features included, such as live backup for VMs when creating a Hyper-V backup, VirtualBox backup, or VMware backup.
On the BackupChain website you will also find various freeware programs for Windows Server, including DriveMaker, a tool that you can use to map an FTP site to a drive letter.

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