Fixing Disk Signature Collision in Azure VM After Cloning or Using Snapshots with Windows

When moving or duplicating Azure Virtual Machines (VMs), you may encounter an issue where the VM’s disk is offline due to a signature collision. This commonly happens when: Since Windows assigns a unique identifier (disk signature) to each disk, if two disks have identical signatures, Windows prevents conflicts by marking…

10/03/2025 Article Bloggers Chris Pietschmann

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